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.

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. 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 and other pursuits include the use of social media to increase organ donation.

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.

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_jackgwJackie Garonzik-Wang, MD PhD
Assistant Professor of Surgery

Jacqueline Garonzik Wang, M.D. Ph.D, 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.

pro_sommgSommer Gentry, PhD 
Professor of Mathematics, US Naval Academy

Dr. 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.

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. 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.

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.

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.

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. 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.

pro_abimAbimereki Muzaale, MD MPH
Instructor of Surgery

Dr. 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.


pro_laurnLauren Nicholas, PhD MPP
Assistant Professor of Economics

Lauren Hersch 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. She 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.

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

Tanjala Purnell PhD, MPH 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.

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

Administration & Communications

pro_ndocNdola Carlest
Grants Management

Ndola is responsible for the fiscal and administrative management of ERGOT.  Ndola serves as the group’s liaison between ERGOT, departmental, and university administrative offices, as well as sponsors, and external collaborators.  Ndola is the point of contact for ERGOT faculty and staff relating to pre- and post-award activity including grant/contract applications and post-award administration of sponsored accounts, and other administrative matters.  Ndola really loves supporting the important work that is happening at ERGOT.  Her guilty is pleasure watching the Marvel series, Luke Cage, because it is set in her hometown of New York City – Harlem.

pro_niczNicole Zonnenberg
Communications Coordinator

Nicole Zonnenberg promotes the lab’s activities and accomplishments through media relations, social media, and special events. She assists the lab with internal communication and lab outreach to other institutions. Her research interests include the relationship between social media and healthcare. In her free time, Nicole enjoys swing dancing at Baltimore’s local Mobtown Ballroom.

Research Data Analysts

pro_sunjbSunjae Bae, KMD MPH

Sunjae 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_erichEric Chow
Senior Research Data Analyst

Eric is a data scientist with a research interest in medical decision process modeling. He codes in Stata but would rather in R.

select publications:
• Van Arendonk KJ1, Chow EK, James NT, Orandi BJ, Ellison TA, Smith JM, Colombani PM, Segev AD. Choosing the order of deceased donor and living donor kidney transplantation in pediatric recipients: a Markov decision process model. Transplantation. 2015 Feb;99(2):360-6.
• Chow EKH*, Massie A*, Muzaale A, Singer A., Kucirka L, Montgomery RA, Lehmann HP, Segev DL. Identifying Appropriate Recipients for CDC Infectious Risk Donor Kidneys. Am J Transplant 2013; 13(5): 1227-34.
• Grams ME, Chow EKH, Segev DL, Coresh J. Lifetime incidence of chronic kidney disease stages 3-5 in the United States. Am J Kidney Dis. 2013; 62(2):245-52. PMID: 23566637.

pro_jenhQiong Huang, MHS MS

Qiong Jenny Huang is a data analyst and is currently preparing to apply to a PhD program. She received her MHS from Johns Hopkins Bloomberg School of Public Health and MS in Information Systems from University of Maryland Baltimore County. Her research focuses include outcomes of kidney and liver transplantation in elderly patients, induction immunosuppression and older donors. In her spare time, Jenny enjoys hiking, reading, and attending concerts and symphonies.

pro_xunXun Luo, MD MPH

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

pro_israoIsrael Olorundare, MD MPH
Post Doctoral Research Fellow

Israel Olorundare is a post doc fellow. He obtained his MD degree from the University of Ilorin, Nigeria and an MPH from the Johns Hopkins Bloomberg School of Public Health. His research focus include(s) examining the the impact of frailty on outcomes in kidney transplant candidates and recipients, as well as the outcomes of transplant recipients after general surgery procedures.

select publications:
•  Abt NB, De la Garza-Ramos R, Olorundare IO, McCutcheon BA, Bydon A, Fogelson J, Nassr A, Bydon M. Thirty day postoperative outcomes following anterior lumbar interbody fusion using the national surgical quality improvement program database. Clin Neurol Neurosurg. 2016 Apr;143:126-31
•  Bydon M, Abt NB, De la Garza-Ramos R, Olorundare IO, McGovern K, Sciubba DM, Gokaslan ZL, Bydon A. Impact of Age on Short-term Outcomes After Lumbar Fusion: An Analysis of 1395 Patients Stratified by Decade Cohorts.  Neurosurgery. 2015 Sep;77(3):347-53.
•  Soares KC, Baltodano PA, Hicks CW, Cooney CM, Olorundare IO, Cornell P, Burce K, Eckhauser FE.  Novel wound management system reduction of surgical site morbidity after ventral hernia repairs: a critical analysis. Am J Surg. 2015 Feb;209(2):324-32.

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.

pro_haoyHao Ying, ScM

Hao Ying is a data analyst and is currently applying his knowledge of Statistics and Epidemiology into the realm of health. He received his ScM from Johns Hopkins Bloomberg School of Public Health. His research focus include assessing post-transplant outcome in kidney transplant recipient, characterization of frailty in patients with ESRD and older populations.

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.

Medical & Graduate Students

pro_scraShannon Cramm

Shannon Cramm is a 2016 Doris Duke Research Fellow. She is currently in her fourth year of medical school at the University of Michigan currently applying to residency programs in general surgery for the 2017 Match. Her research focuses primarily on center-level variation in complications and outcomes in transplant recipients. In her free time, Shannon enjoys hiking, riding horses, and spending time with friends and family.

Tanveen Ishaque


pro_joelJoseph Leanza

Joseph Leanza is a 4th year medical student at the Mount Sinai School of Medicine in New York. His research focuses on costs affecting liver/kidney donors, psychosocial outcomes following live kidney donation, and outcomes following liver/kidney transplantation. He will begin an emergency medicine residency program in July 2017.

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_jessrJessica Ruck

Jessica Ruck is a medical student at Johns Hopkins School of Medicine and a Doris Duke Clinical Research Mentorship grantee.  Her research focus is on the education and experience of living kidney and liver donors.  She will be applying for a residency in General Surgery.

pro_megsMegan Salter, PhD

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. Megan’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.

pro_linwLinxuan Wu

Linxuan is a student research assistant and is currently a second-year master in Johns Hopkins Bloomberg School of Public Health.  Her research focuses on evaluating center-level variations and geographic disparity in organ transplantation.

pro_rogzRoger Zou

Roger Zou is a medical student at the Johns Hopkins School of Medicine. Roger’s research focuses primarily on resolving disparities in organ transplantation by optimizing policy decisions.


pro_yewaYewande Alimi, MD

Yewande Alimi is a general surgery resident from Georgetown University hospital and Johns Hopkins Post-doctoral research fellow.  . She is recently earned her master’s degree in clinical investigation from the Johns Hopkins Bloomberg School of Public Health. Yewande’s research focuses primarily on disparities in the outcomes following transplantation, colorectal surgical outcomes both in and out of the transplant population, and enhanced recovery protocols after surgery. She is driven by disparities in access to healthcare and hope to make a mark on the field. She enjoys cycling, baking, and learning to the play the guitar.

selected publications:
•  Farley C, Alimi Y, Espinosa LR, Perez S, Knechtle W, Hestley A, Carlson GW, Russell MC, Delman KA, Rizzo M. Tanning beds: A call to action for further educational and legislative efforts. J Surg Oncol. 2015 Aug;112(2):183-7. doi: 10.1002/jso.23969. Epub 2015 Jul 17. PubMed PMID: 26186088.
•  Villanueva MS, Alimi Y. Microscopic colitis (lymphocytic and collagenous), eosinophilic colitis, and celiac disease. Clin Colon Rectal Surg. 2015 Jun;28(2):118-26. doi: 10.1055/s-0035-1549365. Review. PubMed PMID: 26034409; PubMed Central PMCID: PMC4442721.
•  Wang S, Alimi Y, Tong A, Nichols CG, Enkvetchakul D. Differential roles of blocking ions in KirBac1.1 tetramer stability. J Biol Chem. 2009 Jan 30;284(5):2854-60. doi: 10.1074/jbc.M807474200. Epub 2008 Nov 25. PubMed PMID: 19033439; PubMed Central PMCID: PMC2631979.

pro_rascRashikh Choudhury, MD

Rashikh is a general surgery resident who is working toward a PhD in Clinical Investigationst the Bloomberg School of Public Health.  He has a particular interest in Markov Decision modeling.

pro_sandSandra DiBrito, MD

Sandra DiBrito, MD 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.

pro_chrhChristine Haugen, MD

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.

pro_couhCourtenay Holscher, MD

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

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

pro_samhSamantha Halpern

Sammy Halpern is a research assistant in the department of surgery.  She recently completed a BA in chemistry at Johns Hopkins University and intends to continue on to medical school.  Sammy’s research focuses on quality of life among living kidney donors, and HIV-to-HIV transplantation; she also coordinates ERGOT’s WHOLE Donor Study.  She is driven by desire to learn and pursue her interests and by her colleague’s daily excitement and support.  In her free time, Sammy works as a volunteer EMT and enjoys playing sports and baking.

pro_kokoKomal Kumar, MPH

Komal Kumar is a research assistant and is currently researching health systems and processes within the field of transplantation. She received her MPH from Johns Hopkins Bloomberg School of Public Health. Her research focus includes access, barriers, and interventions to increase live donor kidney transplantation.

select publications:
•  Kumar K, King EA, Muzaale AD et al. A Smartphone App for Increasing Live Donation. Am J Transplant. 2016 Jul 12.
•  Salter ML, Kumar K, Law AH, Gupta N, Marks K, Balhara K, McAdams-DeMarco MA, Taylor LA, Segev DL. Perceptions about hemodialysis and transplantation among African American adults with end-stage renal disease: inferences from focus groups. BMC Nephrol. 2015 Apr 9;16:49. doi: 10.1186/s12882-015-0045-1.

pro_katimKathryn Marks
Research Assistant

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



sarrSarah 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.

pro_corwCorey Wickliffe
Senior Research Assistant

Nicholas Cepeda

Jeremy Conte

Lauren Duquette

Harpreet Gill

Nathaniel Green

Molly Hiller

Samuel Holecheck

Erika Lugo Borrero

Alexis Mooney

Galen Mooney

Alexandra Mountford

Christiana Obeng

Savina Reid

Erika Rivera

Eileen Rosello

Jacob Russell

Jonathan Tai

Madeleine Waldram