pro_dorrsDorry Segev, MD PhD
Marjory K. and Thomas Pozefsky Professor of Surgery and Epidemiology
Associate Vice Chair, Department of Surgery
Director, Epidemiology Research Group in Organ Transplantation
Johns Hopkins University

Dr. Dorry Segev is an abdominal transplant surgeon focusing on minimally invasive live donor surgery and incompatible organ transplantation. His research uses advanced statistical methods for mathematical modeling and simulation of medical data, analysis of large healthcare datasets, and outcomes research.

Dr. Segev is supported by multiple grants:

  • R01 from the National Institute of Aging (NIA) to study risk prevention in older adults considering kidney transplantation.
  • R01 from the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) to study long-term health outcomes after live kidney donation for African-Americans.
  • R01 from the NIDDK to study risk and survival benefit from incompatible kidney transplantion.
  • K24 from the NIDDK to study which patients benefit from kidney transplantation. This grant also supports his mentorship towards many members in ERGOT.
  • R01 from the NIDDK to study geographic disparities in kidney and liver allocation.

Core Faculty      Administration & Communications      Research Data Analysts

Medical & Graduate Students      Residents      Research Staff

Core Faculty

Our interdisciplinary Core Faculty provide expertise, teaching, and scientific leadership in areas including epidemiology, transplant surgery, infectious disease, health disparities, health policy and ethics, health economics, computational science, operations and management, mobile health technology, and patient-centered and community-based interventions.

pro_andcAndrew Cameron, MD PhD
Associate Professor of Surgery

Dr. Andrew Cameron was born at Johns Hopkins and raised in Baltimore. He attended Harvard College and returned to Johns Hopkins where he obtained his MD and PhD degrees. His surgical training was spent at the Massachusetts General Hospital and then at UCLA for Liver Transplantation. He returned to Hopkins as Head of the Liver Transplant Program in 2006. His laboratory studies stem cells and the liver to promote drug free transplantation.

Dr. Cameron is supported by an R-01 from the National Institute of Diabetes and Digestive and Kidney Diseases to study the use of social media to increase organ donation.

select publications:
•  Lee BP, Chen PH, Haugen C, Hernaez R, Gurakar A, Philosophe B, Dagher N, Moore SA, Li Z, Cameron AM. Three-year Results of a Pilot Program in Early Liver Transplantation for Severe Alcoholic Hepatitis. Ann Surg. 2017 Jan;265(1):20-29. doi: 10.1097/SLA.0000000000001831.
•  Cameron, AM. Social Media and Organ Donation: The Facebook Effect. PMID: 26208612

pro_chrisdChristine Durand, MD
Assistant Professor of Medicine and Oncology

Dr. Christine Durand, assistant professor of medicine and oncology and member of the Johns Hopkins Kimmel Cancer Center, is involved in clinical and translational research focused on individuals infected with HIV and hepatitis C virus who require cancer and transplant therapies. Her current research efforts include looking at outcomes of hepatitis C treatment after solid organ transplant, the potential use of organs from HIV-infected donors for HIV-infected solid organ transplant candidates, and HIV cure strategies including bone marrow transplantation.

Dr. Durand is supported by multiple grants:

  • R01 from the National Institute of Allergy and Infectious Diseases (NIAID) to study HIV-to-HIV organ transplantation in the US.
  • K23 from the National Cancer Institute (NCI) to study antiretroviral therapy during bone marrow transplant in HIV-1 infection.
  • U01 from the NIAID to study HIV-to-HIV deceased donor kidney transplantation.

select publications:
•  Kucirka LM, Durand CM, Bae S, Avery RK, Locke JE, Orandi BJ, McAdams-DeMarco M, Grams ME, Segev DL. Induction Immunosuppression and Clinical Outcomes in HIV-Infected Kidney Transplant Recipients. Am J Transplant. 2016 Apr 25. doi: 10.1111/ajt.13840
•  Durand CM, Segev D, Sugarman J. Realizing HOPE: The Ethics of Organ Transplantation From HIV-Positive Donors. Ann Intern Med. 2016 Apr 5. doi: 10.7326/M16-0560

pro_jackgwJacqueline Garonzik Wang, MD PhD
Assistant Professor of Surgery

Dr. Jacqueline Garonzik-Wang is an assistant professor of surgery at the Johns Hopkins School of Medicine in the Division of Transplant Surgery. She was born and raised in Baltimore and completed her undergraduate studies in Public Health Sciences at the Johns Hopkins University. She obtained her medical degree at Emory University School of Medicine in Atlanta and then returned to Baltimore to complete her general surgery training as a Halsted Resident at the Johns Hopkins Hospital.

Additionally, she obtained a Ph.D. in Clinical Investigation at the Johns Hopkins Bloomberg School of Public Health. She completed her fellowship in Abdominal Transplant and Hepatobiliary Surgery at Washington University and Barnes-Jewish Hospital in St. Louis. Her areas of clinical expertise include hepatobiliary surgery, liver, pancreas, and kidney transplantation and living kidney donation.

Dr. Garonzik Wang has funding from the Health Resources and Services Administration to study implementation outcomes of the Live Donor Champion program. She also receives support from the National Institutes of Health and Health Resources and Services Administration.

select publications:
•  Orandi BJ, Luo X, Massie AB, Garonzik-Wang JM, Lonze BE, Ahmed R, Van Arendonk KJ, Stegall MD, Jordan SC, Oberholzer J, Dunn TB, Ratner LE, Kapur S, Pelletier RP, Roberts JP, Melcher ML, Singh P, Sudan DL, Posner MP, El-Amm JM, Shapiro R, Cooper M, Lipkowitz GS, Rees MA, Marsh CL, Sankari BR, Gerber DA, Nelson PW, Wellen J, Bozorgzadeh A, Gaber AO, Montgomery RA, Segev DL. Survival Benefit with Kidney Transplants from HLA-Incompatible Live Donors. N Engl J Med. 2016 Mar 10;374(10):940-50. doi: 10.1056/NEJMoa1508380.
•  Orandi BJ, Chow EH, Hsu A, Gupta N, Van Arendonk KJ, Garonzik-Wang JM, Montgomery JR, Wickliffe C, Lonze BE, Bagnasco SM, Alachkar N, Kraus ES, Jackson AM, Montgomery RA, Segev DL. Quantifying Renal Allograft Loss Following Early Antibody-Mediated Rejection. Am J Transplant. 2015 Feb;15(2):489-98. doi: 10.1111/ajt.12982. Epub 2015 Jan 21.
•  Garonzik-Wang JM, Sullivan B, Hiller JM, Cass V, Tchervenkow J, Feldman L, Baran D, Chaudhury P, Cantarovich M, Segev DL, Montgomery RA. International kidney paired donation. Transplantation. 2013 Oct 15;96(7):e55-6. doi: 10.1097/TP.0b013e3182a68879.

pro_sommgSommer Gentry, PhD 
Professor of Mathematics, US Naval Academy

Dr. Sommer Gentry is a Professor in the mathematics department at the U.S. Naval Academy, a Research Associate at the Johns Hopkins University School of Medicine, and senior staff with the Scientific Registry for Transplant Recipients. She graduated from Stanford University in 1998 with a B.S. in Mathematical and Computational Science and a M.S. in Operations Research. She spent a year at Lawrence Livermore National Laboratories before completing a Ph.D. in Electrical Engineering and Computer Science at the Massachusetts Institute of Technology in 2005.

She built operations research models to improve access to organ transplantation, in constant collaboration with her husband, Dorry Segev.  Redistricting is a classical problem in operations research, and we have shown that redistricting liver allocation would significantly reduce harmful geographic disparity in access to liver transplants. Dr. Gentry’s work on redistricting liver allocation was a finalist for the Daniel H. Wagner Prize for Excellence in Operations Research Practice (watch video).

Dr. Gentry’s research in optimization in kidney transplantation has been profiled in Science and TIME magazine, and she was a guest on the Diane Rehm show in 2005. A one-hour Discovery channel show featured her work in conjunction with the transplant team at Johns Hopkins in arranging a three-way paired donation, and her research also played a part in an episode of the mathematical detective show Numb3rs. She has served as an advisor to both the United States and Canada in their efforts to create national paired donation registries. Dr. Gentry was a central figure in lobbying Congress to clarify the legal status of kidney paired donation, which the House and Senate did in December 2007.

In 2009 the Mathematical Association of America selected Dr. Gentry for a national teaching award, the Henry L. Alder award, which recognizes distinguished teaching by a beginning college or university mathematics faculty member. As a graduate student, She was supported by a Department of Energy Computational Science Graduate Fellowship (CSGF) and won a related CSGF essay contest for technical writing that effectively communicates computational science to a lay audience.

Dr. Gentry is supported by an R-01 from the National Institute of Diabetes and Digestive and Kidney Diseases to study geographic disparities in kidney and liver allocation.

select publications:
•  S. Gentry, E.K.H. Chow, A.B. Massie, and D.L. Segev. Gerrymandering for justice: redistricting U.S. liver allocation. Interfaces  45 (5): 462-80, September 2015.
•  S. Gentry, A.B. Massie, S.W. Cheek, K.L. Lentine, E.K.H. Chow, C.E. Wickliffe, N. Dzebashvili, P.R. Salvalaggio, M.A. Schnitzler, D.A. Axelrod, and D. Segev. Addressing geographic disparities in geographic liver transplantation through redistricting. American Journal of Transplantation 13(8): 2052-8, August 2013
•  S. Gentry, D. Segev. The honeymoon phase and studies of nonsimultaneous chains in kidney paired donation. American Journal of Transplantation 11(12):2778-9, December 2011
•  D. Segev, S. Gentry, D. Warren, B. Reeb, and R.A. Montgomery. Kidney paired donation: Optimizing the use of live donor organs. Journal of the American Medical Association, vol. 293, p. 1883-1890, 2005.

pro_maclhMacey Henderson, JD, PhD
Instructor of Surgery

Dr. Macey Henderson’s background in law, ethics, health policy and management support her research into the health outcomes of live kidney donors and transplant patients. She draws on the areas of health information technology, clinical informatics, media, communications, and implementation science to drive innovation and new technology to improve the lives of transplant patients and live donors. As a national expert in organ transplant policy and through her dedication and service to the national organ transplant network, Dr. Henderson actively develops policy and guidance related to the donation and transplantation of organs from living donors to recipients in the U.S.

Dr. Henderson serves on the Board of Directors at the Organ Procurement and Transplantation Network (OPTN) / United Network for Organ Sharing (UNOS).

Dr. Henderson was recently awarded a faculty development grant from the Johns Hopkins Center for AIDS Research funded by the National Institutes of Health and the National Institute of Allergy and Infectious Diseases to conduct research on the informed consent processes of HIV+ living donors under HOPE Act research protocols. She is the principle of Kidney Space—a new Facebook integrated health app designed to help patients and families learn about kidney disease and transplantation.

Dr. Henderson is currently funded by a diversity supplement from the NIDDK to study living kidney donor outcomes, and is a recipient of the Rothman Early Career Development Award for Surgical Research to develop technological innovations in live kidney donor post-donation care management.

select publications:
• Henderson, Macey L., JD PhD. “I Donated a Kidney. I Have No Regrets.” Washington Post. Https://, 5 Oct. 2016. Web.
•  Mittelman M, Thiessen C, Chon WJ, Clayville K, Cronin DC, Fisher JS, Fry-Revere S, Gross JA, Hanneman J, Henderson ML, Ladin K, Mysel H, Sherman LA, Willock L, Gordon EJ. Miscommunicating NOTA Can Be Costly to Living Donors. Am J Transplant. 2016 Sep 6. doi: 10.1111/ajt.14036.
•  Henderson ML, Chevinsky J. Medical ethics and the media: the value of a story. Virtual Mentor. 2014 Aug 1;16(8):642-7. doi: 10.1001/virtualmentor.2014.16.08.msoc2-1408. No abstract available.
Henderson ML, Chevinsky J, Biviji-Sharma R, Mills K. Improving patient-doctor communication about risk and choice in obstetrics and gynecology through medical education: a call for action. J Clin Ethics. 2014 Summer;25(2):176.
•  Henderson ML. Providing more reasons for individuals to register as organ donors. J Clin Ethics. 2012 Fall;23(3):288. No abstract available. 

Maria Lourdes Perez, DVM
Research Program Manager

pro_allmAllan Massie, PhD
Assistant Professor, Surgery and Epidemiology

Dr. Allan Massie is an epidemiologist and assistant professor of surgery. His background in computer science is augmented by his research into genetic determinants of chronic kidney disease, big data in organ transplantation (including registries and administrative databases), and developing risk-predication models.

Dr. Massie is supported by an K01 from the National Institute of Diabetes and Digestive and Kidney Diseases to study chronic kidney disease in African-American live kidney donors.

select publications:
•  Muzaale AD, Massie AB (co-first author), Wang MC, Montgomery RA, McBride MA, Wainright JL, Segev DL. Risk of end-stage renal disease following live kidney donation. JAMA. 2014 Feb 12;311(6):579-86. PMID: 24519297
•  Massie AB, Segev DL. Rates of false flagging due to statistical artifact in CMS evaluations of transplant programs: results of a stochastic simulation. Am J Transplant. 2013 Aug;13(8):2044-51. PMID: 23890285 MELD Exceptions and Rates of Waiting List Outcomes.
•  Massie AB, Caffo B, Gentry SE, Hall EC, Axelrod DA, Lentine KL, Schnitzler MA, Gheorghian A, Salvalaggio PR, Segev DL. Am J Transplant. 2011 Nov;11(11):2362-71. PMID: 21920019 Improving distribution efficiency of hard-to-place deceased donor kidneys: Predicting probability of discard or delay.
•  Massie AB, Desai NM, Montgomery RA, Singer AL, Segev DL. Am J Transplant. 2010 Jul;10(7):1613-20 PMID: 20642686

pro_mmdmMara McAdams-DeMarco, PhD MS
Assistant Professor, Epidemiology and Surgery

Dr. Mara McAdams-DeMarco’s research focuses on the epidemiology of aging with a specific interest patients with end stage renal disease and arthritis. In particular, she is interested in better understanding how frailty can improve risk prediction in kidney transplant recipients and patients undergoing hemodialysis as well as physical function in older adults with treated and untreated gout. She is initiating a project to better understand the intersection of frailty and medication use in older adults. One of her career objectives is to apply novel methods and novel risk factors to the study of older adults with ESRD and arthritis.

Dr. McAdams-DeMarco is supported multiple grants:

  • K01 from the National Institute of Aging to study frailty and health outcomes of aging in older adults with kidney failure.
  • From the Johns Hopkins Bloomberg Faculty Innovation Fund, a grant to study the feasibility and efficacy of hemodialysis-based interventions.
  • From the Mendez National Institute Foundation, a grant to study prehabilitation for adults with end stage renal disease.

select publications:
• McAdams-DeMarco MA, Tan J, Salter M, Gross A, Meoni LA, Jaar BG, Kao WL, Parekh RS, Segev DL, Sozio SM. Frailty and Cognitive Function in Incident Hemodialysis Patients. Clinical Journal of the ASN.
• McAdams-DeMarco MA, James N, Salter ML, Walston J, Segev DL. Trends in kidney transplant outcomes in older adults. Journal of the American Geriatrics Society. 2014; 62: 2235-42.
• McAdams-DeMarco MA, Law A, Garonzik Wang JM, Jaar B, Walston J, Segev DL. Frailty as a novel predictor of mortality and hospitalization in hemodialysis patients of all ages. Journal of the American Geriatrics Society. 2013; 61:896-901.

pro_dougDouglas Mougul, MD MPH
Assistant Professor of Pediatrics

Dr. Douglas Mogul is an Assistant Professor in the Division of Pediatric Gastroenterology and Hepatology. His primary interest is in improving our system of organ allocation for children awaiting liver transplantation. He has also developed several digital tools to help children with liver disease including PoopMD, a mobile app that helps parents identify whether their child may have a life-threatening liver disease, and Liver Space, a Facebook-integrated health app that seeks to strengthen online liver communities by providing members with tools to facilitate communication between families, and connects them with the medical community.

Dr. Mogul is supported by a K08 from the Agency for Healthcare Research and Quality (AHRQ) to study pediatric liver transplant allocation.

select publications:
• Mogul D, Nakamura Y, Seo J, Blauvelt B, Bridges JF. The unknown burden and cost of celiac disease in the U.S.. Expert Rev Pharmacoecon Outcomes Res. 2017 Apr;17(2):181-188. doi: 10.1080/14737167.2017.1314785.

pro_abimAbimereki Muzaale, MD MPH
Instructor of Surgery

Dr. Abimereki Muzaale is an instructor of surgery in the Division of Transplant Surgery. His postdoctoral research focused on the physiological consequences of live kidney donation and it challenged the orthodoxy fundamentally. The prevailing belief for over 50 years was that a donor faced no additional risk attributable to donor nephrectomy. However, he and his colleagues demonstrated an increase in risk of end-stage renal disease (ESRD) following live kidney donation, albeit from a very low baseline risk. As a corrective, live donor consent forms across the world now cite his work. His recent research proposes key causal pathways underlying the increase in risk of ESRD following donation and highlights potential points of intervention in both the predonation and postdonation periods.

Dr. Muzaale is supported by a Supplement to an R01 from the National Institute of Diabetes and Digestive and Kidney Diseases to study incompatible kidney transplants.


pro_laurnLauren Nicholas, PhD MPP
Assistant Professor of Economics

Dr. Lauren Nicholas is a health economist whose research focuses on the role of public policy in improving health and healthcare quality for the elderly. Her current research combines survey, administrative, and clinical data to study the interaction between healthcare utilization and economic outcomes. Dr. Nicholas’s work uses clinical and econometric approaches to answer questions in medical and health economics, particularly for surgery and end-of-life care.

Dr. Nicholas is the principal investigator of a project funded by the Arnold Foundation assessing the potential for alternative quality metrics to increase the volume and quality of organ transplants in the United States. She is also supported by two grants:

  • K01 from the National Institute of Aging (NIA) to study geographic variation in the health and economic determinants and outcomes of elective surgery for arthritis, back pain, cataracts and heart disease.
  • R21 from the NIA to study consumer credit data to identify precursors and consequences of cognitive impairment.

select publications:
•  Nicholas LH, Dimick JB. 2013. Bariatric Surgery in Minority Patients Before and After Implementation of a Centers of Excellence Program. JAMA, 310(13):1399-1400.
•  Nicholas LH, Langa KM, Iwashyna TJ, Weir DR (2011). Regional Variation in the Association Between Advance Directives and End-of-Life Medicare Expenditures, JAMA, 306(13): 1447 – 1453.
•  McInerney M, Mellor M, Nicholas LH. 2013. Recession Depression: Mental Health Effects of the 2008 Stock Market Crash. Journal of Health Economics, 32(6): 1090 – 1104.
•  Nicholas LH. 2013. Better Quality of Care or Healthier Patients? Hospital Utilization by Medicare Advantage and Fee-for-Service Enrollees. Forum for Health Economics & Policy, 16(1).

pro_tanjpTanjala Purnell, PhD MPH
Assistant Professor, Surgery and Epidemiology

Dr. Tanjala Purnell is an Assistant Professor of Transplant Surgery and Epidemiology at Johns Hopkins University. Her research primarily focuses on identifying patient-centered and stakeholder-engaged solutions to improve equity in access to kidney transplantation. Her NIH, AHRQ, and PCORI-funded research also involves studies to improve healthcare equity for patients with kidney disease and related risk factors, including diabetes and hypertension. Dr. Purnell is the Training Director of the Johns Hopkins Center to Eliminate Cardiovascular Health Disparities where she co-directs a course on innovative methods for health equity research. Her work is driven by her passion to achieve health and healthcare equity.

Dr. Purnell serves on the Minority Affairs Committee at the Organ Procurement and Transplantation Network (OPTN) / United Network for Organ Sharing (UNOS). She is also supported by a K01 from the Agency for Healthcare Research and Quality (AHRQ) to study patient-centered strategies to reduce disparities in access to kidney transplantation.

select publications:
•  Purnell TS, Luo X, Kucirka LM, Cooper LA, Crews DC, Massie AB, Boulware LE, Segev DL. 
Reduced Racial Disparity in Kidney Transplant Outcomes in the United States from 1990 to 2012.J Am Soc Nephrol. 2016 Feb 4. PMID: 26848153
•  Kucirka LM, Purnell TS, Segev DL. Improving Access to Kidney Transplantation: Referral Is Not Enough. JAMA. 2015 Aug 11;314(6):565-7. PMID: 26262793
•  Purnell TS, Xu P, Leca N, Hall YN. Racial differences in determinants of live donor kidney transplantation in the United States. Am J Transplant. 2013 Jun;13(6):1557-65. PMID: 23669021
•  Purnell TS, Hall YN, Boulware LE. Understanding and overcoming barriers to living kidney donation among racial and ethnic minorities in the United States. Adv Chronic Kidney Dis. 2012 Jul;19(4):244-51. PMID: 22732044
•  Purnell TS, Auguste P, Crews DC, Lamprea-Montealegre J, Olufade T, Greer R, Ephraim P, Sheu J, Kostecki D, Powe NR, Rabb H, Jaar B, Boulware LE. Comparison of life participation activities among adults treated by hemodialysis, peritoneal dialysis, and kidney transplantation: a systematic review. Am J Kidney Dis. 2013 Nov;62(5):953-73. PMID: 23725972

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Research Data Analysts

pro_sunjbSunjae Bae, KMD MPH

Dr. Sunjae Bae is a data analyst and a PhD student in epidemiology. He received his KMD from Kyung Hee University and MPH from Johns Hopkins Bloomberg School of Public Health. His research focus includes donor/recipient risk modeling; effects of immunosuppresive agents; and complications following kidney transplant.

select publications:
• Bae S, Massie AB, Luo X, Anjum S, Desai NM, Segev DL. Changes in discard rate after the introduction of the Kidney Donor Profile Index (KDPI). Am J Transplant. 2016 jMar 2. doi 10.1111/ajt.13769

pro_mgboMary Grace Bowring, MPH

Mary Grace Bowring is a research data analyst in our group. She received her MPH in Epidemiology from George Washington Milken School of Public Health in 2015, and will be applying to medical school in Summer 2018. Her research focuses include Hepatitis C infection in deceased donor transplantation, decision making in organ allocation, and impacts of public policy on transplant center’s willingness to accept marginal organs.

select publications:
• Bowring MG, Kucirka LM, Massie AB, Luo X, Cameron A, Sulkowski M, Rakestraw K, Gurakar A, Kuo I, Segev DL, Durand CM. Changes in Utilization and Discard of Hepatitis C-Infected Donor Livers in the Recent Era. Am J Transplant. 2016 Jul 26. doi: 10.1111/ajt.13976
• Lauren M Kucirka, Sc.M., Mary G Bowring, Allan B Massie, Ph.D., Xun Luo, M.D., M.P.H., Lauren Hersch Nicholas, Ph.D., and Dorry L Segev, M.D., Ph.D. Landscape of Deceased Donors Labeled Increased Risk for Disease Transmission Under New Guidelines. Am J Transplant. 2015 Dec; 15(12): 3215–3223.Published online 2015 May 27. doi:  10.1111/ajt.13356

pro_xunXun Luo, MD MPH

Dr. Xun Luo is Senior Research Data Analyst. He currently holds Master of Public Health and Doctor of Medicine. Xun’s research focuses primarily on clinical outcomes, disparities and policy changes in solid organ transplantation. He is driven by improvement of health care and optimization of organ allocation system.

select publications:
•  Orandi BJ, Luo X, Massie AB, Garonzik-Wang JM, Lonze BE, Ahmed R, Van Arendonk KJ, Stegall MD, Jordan SC, Oberholzer J, Dunn TB, Ratner LE, Kapur S, Pelletier RP, Roberts JP, Melcher ML, Singh P, Sudan DL, Posner MP, El-Amm JM, Shapiro R, Cooper M, Lipkowitz GS, Rees MA, Marsh CL, Sankari BR, Gerber DA, Nelson PW, Wellen J, Bozorgzadeh A, Gaber AO, Montgomery RA, Segev DL. Survival Benefit with Kidney Transplants from HLA-Incompatible Live Donors. N Engl J Med. 2016 Mar 10;374(10):940-50. doi: 10.1056
•  Purnell TS, Luo X, Kucirka LM, Cooper LA, Crews DC, Massie AB, Boulware LE, Segev DL. Reduced Racial Disparity in Kidney Transplant Outcomes in the United States from 1990 to 2012. J Am Soc Nephrol. 2016 Feb 4. pii: ASN.2015030293

Alvin Thomas, MSPH

Alvin Thomas is a data analyst with an interest in interesting questions. He received his MSPH in International Health from Johns Hopkins Bloomberg School of Public Health. His research interests in include living donor health and big data in organ transplantation.

Select publications:
•  Alvin G. Thomas, Henderson, Macey L., Ashton Shaffer, Allan B. Massie, Xun Luo, Courtenay M. Holscher, Tanjala S. Purnell, Krista Lentine, and Dorry L. Segev. “The National Landscape of Living Kidney Donor Follow‐up in the United States.” American Journal of Transplantation (2017). Link:


pro_shezSheng Zhou, MBBS ScM

Sheng Zhou is a research data analyst in our lab. She finished her MBBS in Tongji Medical College, and completed her ScM in Epidemiology in Johns Hopkins Bloomberg School of Public Health. She enjoys the process of unveiling hidden information from the chaos of data. Her research interests include assessing policy changes, geographic disparity in organ transplantation, and short-term/long-term post-transplant outcomes.

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Medical & Graduate Students

PRO_KCORKarina Covarrubias

Karina Covarrubias is a medical student at Johns Hopkins School of Medicine and a Doris Duke Clinical Research Mentorship  grantee. Her research interests include time to kidney transplantation under the new KAS and disparities in organ allocation. She will be applying for a general surgery residency.

PRO_MIVAMayara Ivani de Paula, PharmD, MHS

Dr. Ivani de Paula is a clinical researcher and currently working as a trainee in the Epidemiology Dept at Johns Hopkins Medical School. She received her PharmD degree  from Universidade Estadual de São Paulo and obtained her Masters degree in Health Science at Universidade Federal de São Paulo. Her research focus includes safety and efficacy of immunosuppression, induction therapy, kidney transplantation, clinical epidemiology, clinical trials design, and advanced statistical analysis.

select publications:
•  Oliveira NI, Paula MI, Felipe CR, Tedesco-Silva H, Medina-Pestana JO. Limitations of the interpretation and extrapolation of clinical trial data in kidney transplant recipients. Clin Transplant. 2017 Jun 30. doi: 10.1111/ctr.13046. [Epub ahead of print]
•  Ferreira A, Felipe C, Cristelli M, Viana L, Basso G, Stopa S, Mansur J, Ivani M, Bessa A, Ruppel P, Aguiar W, Campos E, Gerbase-DeLima M, Proença H, Tedesco-Silva H, Medina-Pestana J. Donor-Specific Anti-Human Leukocyte Antigens Antibodies, Acute Rejection, Renal Function, and Histology in Kidney Transplant Recipients Receiving Tacrolimus and Everolimus. Am J Nephrol. 2017;45(6):497-508. doi: 10.1159/000475888. Epub 2017 May 17
•  Tedesco-Silva H Junior, Mello Offerni JC, Ayres Carneiro V, Ivani de Paula M, Neto ED, Brambate Carvalhinho Lemos F, Requião Moura LR, Pacheco E Silva Filho A, de Morais Cunha MF, Francisco da Silva E, Miorin LA, Demetrio DP, Luconi PS, da Silva Luconi WT, Bobbio SA, Kuschnaroff LM, Noronha IL, Braga SL, Barsante RC, Mendes Moreira JC, Fernandes-Charpiot IMM, Abbud-Filho M, Modelli de Andrade LG, Dalsoglio Garcia P, Tanajura Santamaria Saber L, Fernandes Laurindo A, Chocair PR, Cuvello Neto AL, Zanocco JA, Duboc de Almeida Soares Filho AJ, Ferreira Aguiar W, Medina Pestana J. Randomized Trial of Machine Perfusion Versus Cold Storage in Recipients of Deceased Donor Kidney Transplants With High Incidence of Delayed Graft Function. Transplant Direct. 2017 Apr 18;3(5):e155. doi: 10.1097/TXD.0000000000000672. eCollection 2017 May.

pro_hasmHasina Maredia

Hasina is a second year medical student at Johns Hopkins School of Medicine researching cardiothoracic transplant outcomes in the lab. She loves working with large national health care databases and is driven by wanting to reduce demographic disparities in heart and lung transplant outcomes, as well as to inform evidence-based allocation of these scarce thoracic organs through her work.

pro_megsMegan Salter, PhD

Dr. Megan Salter received her MHS and PhD in Infectious Disease Epidemiology at the Johns Hopkins Bloomberg School of Public Health before completing a Postdoctoral Research Fellowship with our lab through the Johns Hopkins Center on Aging and Health. She is currently earning her medical degree at the Johns Hopkins School of Medicine. Salter’s research focuses primarily on access to transplantation and patient-provider communication about transplantation among older adults. She additionally is interested in how measures of aging such as frailty and walking speed may apply to patients with chronic disease such as end-stage renal disease. She is driven by a passion to improve evidence-based patient-centered care for older adults.

select publications:
•  Salter ML, Orandi B, McAdams DeMarco MA, Law A, Meoni LA, Jaar BG, Sozio SM, Kao WH, Parekh RS, Segev DL. Patient and provider reported information about transplantation and subsequent waitlisting. JASN. In Press. 2014
•  Salter ML, McAdams-DeMarco MA, Law A, Meoni LA, Jaar BG, Sozio SM, Kao WH, Parekh RS, Segev DL. Age and sex disparities in discussion about kidney transplantation among dialysis patients. J Am Geriatr Soc. 2014 May;62(5):843-9.
•  Salter ML, Gupta N, King E, Bandeen-Roche K, McAdams DeMarco MA, Law A, Meoni LA, Jaar BG, Sozio SM, Kao WH, Parekh RS, Segev DL. Health-related and psychosocial concerns about kidney transplantation among patients initiating dialysis. CJASN. In Revisions. 2014.

PRO_ASHAshton Shaffer

Ashton Shaffer is an MD-PhD student at the Johns Hopkins School of Medicine and the Johns Hopkins Bloomberg School or Public Health. She is currently working on her dissertation in Infectious Disease Epidemiology. Ashton’s research focuses on modeling outcomes for candidates and recipients with HIV and/or hepatitis C virus. She is particularly interested in using biostatistical methods to draw the appropriate causal inferences in observational organ transplant studies. When she’s not working in the lab, she can be found gardening or biking with her puppy.

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pro_sandSandra DiBrito, MD

Dr. Sandra DiBrito is a general surgery resident at Johns Hopkins Hospital. She is currently a PhD candidate in Clinical Investigations at the Johns Hopkins Bloomberg School of Public Health. Sandra’s research focuses primarily on outcomes of transplant recipients following general surgery procedures. Following her PhD, she intends to pursue a trauma/acute care surgery fellowship.

Dr. DiBrito is supported by an F-32 from the National Institute of Diabetes and Digestive and Kidney Diseases to study live kidney donor risks and outcomes.

pro_chrhChristine Haugen, MD

Dr. Christine Haugen is a general surgery resident at Johns Hopkins Hospital. She is currently a PhD candidate in Clinical Investigations at the Johns Hopkins Bloomberg School of Public Health. Christine’s research focuses primarily on outcomes of frailty and older adults following liver and kidney transplant. She intends to pursue a transplant surgery fellowship.

Dr. Haugen is supported by an F-32 from the National Institute of Aging to study outcomes of frailty and older adults following liver and kidney transplant. She intends to pursue a transplant surgery fellowship.

pro_couhCourtenay Holscher, MD

Dr. Courtenay Holscher is a Halsted General Surgery Resident at Johns Hopkins Hospital currently earning a PhD at the Johns Hopkins Bloomberg School of Public Health during a dedicated research fellowship. Her research focuses primarily on living kidney donors.

Dr. Holscher is supported by an F-32 from the National Institute of Diabetes and Digestive and Kidney Diseases to study post-donation renal function in living kidney donors.

PRO_KJACKyle Jackson, MD

Dr. Kyle Jackson is a General Surgery Resident at Johns Hopkins Hospital. He received his M.D. from the University of Pittsburgh School of Medicine. He is currently pursuing a Ph.D. in Clinical Investigation at the Johns Hopkins Bloomberg School of Public Health. After residency, he  plans to enter a fellowship in Abdominal Transplant Surgery. His research focuses on developing optimal management strategies for highly sensitized kidney transplant recipients.

Dr. Jackson is supported by an F32 from the National Institute of Diabetes and Digestive and Kidney Diseases to study incompatible living donor kidney transplantation and kidney paired donation.

PRO_MKOSMartin Kosztowski, MD

Dr. Martin Kosztowski is a general surgery resident at the University of Iowa. He previously completed an MPH AT Johns Hopkins in 2014 where his concentration was Biostatistical and Epidemiological Methods in Clinical Research.  His research focuses on the utilization of suboptimal kidneys.  He is also interested in pursuing a career in cardiothoracic surgery, so he will be looking at outcomes after heart and lung transplants.

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Research Staff

pro_saadSaad Anjum

Saad Anjum is a research assistant at ERGOT. After graduating from Johns Hopkins University with a degree in the Writing Seminars, he joined ERGOT to research live donation and HIV-to-HIV transplant. He is currently pursuing his medical degree at the University of Florida College of Medicine.

select publications:
• Anjum S, Muzaale AD, Massie AB, Bae S, Luo X, Grams ME, Lentine KL, Garg AX, Segev DL. Brief Report: Patterns of End Stage Renal Disease Caused by Diabetes, Hypertension, and Glomerulonephritis in Live Kidney Donors. Am J Transplant. 2016 Jun 11. doi: 10.1111/ajt.13917

Annie Eno

Annie is a research assistant in our lab. She earned her degree in Biochemistry at Loyola University Maryland and her research primarily focuses on follow-up and post-donation care of living donors.


PRO_JKON.pngJonathan Konel, MHS

Jon Konel is a research assistant on our team and currently coordinates the multi-center ENGAGE study. He received both his Bachelor’s and Master’s degrees from Johns Hopkins University and is interested in attending medical school. His research focuses include increasing access to transplantation using social media and improving outcomes for transplant recipients.

Select Publications:
• Kumar K, King EA, Muzaale AD, Konel JM, Bramstedt KA, Massie AB, Segev DL & Cameron AM. A Smartphone App for Increasing Live Organ Donation. Am J Transplant 2016; 16: 3548–3553

pro_katimKathryn Marks

Kathryn works to directly support ERGOT’s faculty and staff.



sarrSarah Van Pilsum Rasmussen

Sarah Rasmussen is a research assistant. She studied Medical Anthropology at Macalester College and researched gender bias in transplantation in Nepal as a Fulbright Scholar. She uses qualitative methods to study the ethics of current issues in transplantation, including living donation, HIV-to-HIV transplants and HCV-positive to HCV-negative transplants.

select publications:
• Van Pilsum Rasmussen SE, Henderson ML, Kahn J, Segev D. Considering Tangible Benefit for Interdependent Donors: Extending a Risk-Benefit Framework in Donor Selection. Am J Transplant. 2017 Apr 20. doi: 10.1111/ajt.14319

Fatima Warsame

Fatima Warsame is a research assistant. She studied Neuroscience and Behavior at Columbia University and is researching outcomes following kidney and liver transplantation. She is specifically interested in the relationship between aging, cognitive performance, and transplantation. She is currently applying to medical school and hopes to combine medicine and epidemiology.

PRO_MAWMadeleine Waldram

Madeleine Waldram is a research assistant in our group. She coordinates the multi-center WHOLE Donor Study, our group’s follow-up registry of living kidney donors, and her research focuses primarily on improving follow-up care and outcomes among living donors. She graduated from Johns Hopkins University with a degree in Public Health Studies and plans to pursue a career in medicine..

Jeremy Conte

Samuel Holecheck

Erika Lugo Borrero

Alexandra Mountford

Christiana Obeng

Eileen Rosello

Jacob Russell


Shivani Bisen

Nicholas Cepeda

Giovanni Cragnotti

Lilly Fang

Scott Frankenthaler

Harpreet Gill

Alexander Hsiao

Vincent Huang

Anna HKoerner

Kristin Meek

Alexis Mooney

Sanjana Murthy

Salma Tayel

Eileen Yu

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