Daniel C. Brennan, M.D., joins the Johns Hopkins Division of Renal Medicine as professor of nephrology and medical director of the Comprehensive Transplant Center. Dr. Brennan’s areas of clinical expertise include transplant nephrology and renal disease. Prior to joining Johns Hopkins, Dr. Brennan was the Alan A. and Edith L. Wolff Professor of renal Diseases at Washington University and the Director of Transplant Nephrology at the Washington University School of Medicine. He received his undergraduate degree from Cornell College and earned his medical degree at the University of Iowa, where he completed a residency in internal medicine. He then completed research and clinical nephrology fellowships at Brigham & Women’s Hospital/Harvard Medical School. Dr. Brennan holds professional memberships at various organizations, including the American College of Physicians, the International Society of Nephrology, the American Society of Nephrology, The Transplantation Society, the American Society of Transplant Physicians and the American Society of Clinical Investigation. Dr. Brennan is rated as an Elite provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are Chronic Kidney Disease, Cytomegalovirus Infection, Cytomegalic Inclusion Disease, Kidney Transplant, and Pancreas Transplant.

Steve Sozio is a Nephrologist in Baltimore, Maryland. Dr. Sozio is rated as an Elite provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are Chronic Kidney Disease, End-Stage Renal Disease (ESRD), Calcinosis, Renovascular Hypertension, and Kidney Transplant.

Dr. Crews is a Professor of Medicine in the Division of Nephrology at the Johns Hopkins University School of Medicine. She holds faculty appointments with the School of Nursing, the Welch Center for Prevention, Epidemiology and Clinical Research, the Center on Aging and Health, and the Center for Health Equity, where she is Deputy Director. Her research program aims to advance equity in kidney disease and hypertension outcomes by focusing on social drivers of health inequities. An elected member of the American Society for Clinical Investigation, Dr. Crews has received numerous awards for her research contributions, including the 2018 Johns Hopkins University President’s Frontier Award--a $250,000 award granted to a single faculty scholar on the cusp of transforming their field. She is a former National Academy of Medicine (NAM) Emerging Leader Scholar and was the inaugural Gilbert S. Omenn Anniversary Fellow of the NAM. In 2019, Dr. Crews received the W. Lester Henry Award for Diversity and Access to Care from the American College of Physicians and the Distinguished Leader Award from the American Society of Nephrology. Dr. Crews is the founding director of the Doctoral Diversity Program, a 2-year, research-intensive post-baccalaureate program of the Johns Hopkins Initiative for Careers in Science and Medicine. Dr. Crews received her undergraduate degree from the University of Virginia and her medical degree from Saint Louis University. A graduate of the Osler Medical Training Program, she completed nephrology fellowship and a master’s in clinical epidemiology degree at Johns Hopkins. Dr. Crews is rated as an Elite provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are Chronic Kidney Disease, End-Stage Renal Disease (ESRD), Arteriovenous Malformation, Kidney Transplant, and Nephrectomy.

Matthew Weir is a Nephrologist in Baltimore, Maryland. Dr. Weir is rated as an Elite provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are High Potassium Level, Chronic Kidney Disease, End-Stage Renal Disease (ESRD), Kidney Transplant, and Nephrectomy. Dr. Weir is currently accepting new patients.

Dr. Bernard Jaar is an associate professor of medicine at the Johns Hopkins University School of Medicine. He holds a joint appointment in epidemiology at the Johns Hopkins Bloomberg School of Public Health. His areas of clinical expertise include chronic kidney disease and all dialysis modalities. Dr. Jaar earned his M.D. from Faculte de Medecine et de Pharmacie of the State University of Haiti. He completed nephrology training at Hopitaux de Paris (Hopital Tenon, Hopital Saint Antoine, Hopital Saint Louis) University of Paris V, France. He subsequently completed an internal medicine residency at Graduate Hospital in Philadelphia and a nephrology fellowship at the Johns Hopkins Hospital, in addition to a post-doctoral fellowship in Epidemiology and a Master in Public Health at the Johns Hopkins Bloomberg School of Public Health. His research interests include epidemiology of chronic kidney disease and end-stage kidney disease, particularly survival in dialysis patients, peripheral arterial disease and environmental risk factors for kidney disease. Dr. Jaar was recognized with the C. Lockard Conley Award 2021 by the American College of Physician Maryland Chapter for contributions to resident education / research and the National Kidney Foundation Garabed Eknoyan Award 2022 for promoting the mission of NKF in making the lives of people with kidney disease better. He is a member of several professional organizations, including the International Society of Nephrology, American Society of Nephrology, National Kidney Foundation, American College of Physicians and the International Society of Peritoneal dialysis. Dr. Jaar is rated as an Elite provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are Chronic Kidney Disease, End-Stage Renal Disease (ESRD), Calcinosis, Low Potassium Level, and Kidney Transplant.

Michelle Estrella is a Nephrologist in Baltimore, Maryland. Dr. Estrella is rated as an Elite provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are Chronic Kidney Disease, End-Stage Renal Disease (ESRD), Focal Segmental Glomerulosclerosis, Prerenal Azotemia, and Kidney Transplant.

Rulan Parekh is a Nephrologist and a Pediatrics provider in Baltimore, Maryland. Dr. Parekh is rated as an Elite provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are Nephrotic Syndrome, Chronic Kidney Disease, End-Stage Renal Disease (ESRD), Focal Segmental Glomerulosclerosis, and Kidney Transplant.

Mohamed G. Atta, MD, MPH, is Professor of Medicine at Johns Hopkins University School of Medicine in Baltimore, Maryland and Director of Von Hippel Lindau Clinical Care Center at Hopkins. A graduate of Mansoura University School of Medicine in Egypt, he completed his internship and residency training in various locations including the Urology and Nephrology Center at Mansoura University, Cabrini Medical Center in New York, and Johns Hopkins University School of Medicine. Dr. Atta received his MPH degree from Johns Hopkins Bloomberg School of Public Health in 2005. Dr. Atta is a member of the Health Disparity Committee at the Department of Health and Mental Hygiene in Maryland, the Scientific Council on Kidney of the American Heart Association, the International Society of Nephrology, and the American Society of Nephrology. Dr. Atta has participated as principal investigator in several studies, clinical trials, and serves as a peer reviewer for the Journal of Clinical Investigation, Archives of Internal Medicine, American Journal of Medicine, Kidney International, Journal of the American Society of Nephrology, Clinical Journal of the American Society of Nephrology, American Journal of Kidney Diseases, Clinical Infectious Disease, and Journal of Infectious Diseases among others. He authored or co-authored numerous articles published in Genomics, the Journal of Biological Chemistry, Journal of clinical investigation, Clinical Infectious Disease, Circulation, Stem Cells Translational Medicine, American Journal of Medicine, and American Journal of Transplantation, Journal of the American Society of Nephrology, Clinical Journal of the American Society of Nephrology, American Journal of Kidney Disease, Nephrology Dialysis Transplantation, and Kidney International, among others. Dr. Atta is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are End-Stage Renal Disease (ESRD), Glomerulonephritis, Lupus Nephritis, Chronic Kidney Disease, and Kidney Transplant.

Dr. C. John Sperati is an Associate Professor of Medicine at the Johns Hopkins University School of Medicine. His areas of clinical expertise include renal medicine. Dr. Sperati is Director of the Glomerular Diseases Fellowship Program since 2023 and formerly directed the Nephrology Fellowship Training Program from 2019 - 2025. He was the long-serving Firm Faculty Leader of the Barker Firm and has held leadership positions within the Osler Medical Residency training program. In addition, he co-directs the Johns Hopkins Osler Learning Initiative which brings the principles of medical residency training to executive education worldwide. He obtained his medical degree from The Pennsylvania State University College of Medicine and a Master in Health Science from the Johns Hopkins Bloomberg School of Public Health. He completed an internship and residency in Internal Medicine at the Johns Hopkins Hospital, followed by a year as an Assistant Chief of Service (chief resident). He subsequently pursued subspecialty training in nephrology at the Johns Hopkins Hospital and joined the faculty in the Division of Nephrology. Dr. Sperati’s clinical interests are in thrombotic microangiopathy including atypical hemolytic uremic syndrome (aHUS), complement-mediated kidney diseases including C3 glomerulopathy, glomerular disease such as glomerulonephritis (e.g., IgA nephropathy, MPGN) and nephrotic syndromes (e.g., FSGS, membranous, minimal change, amyloidosis, and others), and secondary and resistant hypertension (e.g., fibromuscular dysplasia, atherosclerotic renal arterial disease, hyperaldosteronism, and genetic hypertensive syndromes). He is the site principal investigator for clinical trials in glomerular disease, serves on editorial boards, and chairs the approval committee of the Longitudinal Knowledge Assessment for nephrology for the American Board of Internal Medicine. His clinical acumen and educational contributions have been recognized by induction into the Miller Coulson Academy of Clinical Excellence as well as the American Society of Nephrology Distinguished Educator Award in 2020. He has been recognized as a physician resource through the Atypical HUS Foundation, a NephCure glomerular disease specialist, an IgA Nephropathy Foundation specialist, and a Baltimore TopDoc. He is registered with the Florida Department of Health to perform telehealth services for patients in Florida. Dr. Sperati is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are Atypical Hemolytic Uremic Syndrome (aHUS), D-Plus Hemolytic Uremic Syndrome, Hemolytic-Uremic Syndrome, Glomerulonephritis, and Kidney Transplant.

Jia Liu is a Nephrologist in Columbia, Maryland. Dr. Liu is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are Nephrosclerosis, Renovascular Hypertension, Acute Kidney Failure, and Chronic Kidney Disease.

Tin Maung is a Nephrologist in Columbia, Maryland. Dr. Maung is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are Nephrosclerosis, Renovascular Hypertension, Chronic Kidney Disease, and Acute Kidney Failure.

Mary Pieprzak is a Nephrologist in Columbia, Maryland. Dr. Pieprzak is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are Nephrosclerosis, Renovascular Hypertension, Acute Kidney Failure, and Chronic Kidney Disease.

Ping-hsin Chen is a Nephrologist in Columbia, Maryland. Dr. Chen is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are Renovascular Hypertension, Acute Kidney Failure, Acute Tubular Necrosis, and Nephrosclerosis.

Dr. Sumeska Thavarajah is an assistant professor of medicine at the Johns Hopkins University School of Medicine. Her areas of expertise include nephrology. Dr. Thavarajah earned her M.D. at Wayne State University School of Medicine. She completed her residency at the University of Connecticut Health Center and performed nephrology fellowships at Johns Hopkins Bayview Medical Center and the University of Connecticut Health Center. She serves as chair of the National Kidney Foundation of Maryland’s Medical Advisory Board. She was recognized by the National Kidney Foundation of Maryland with a Linda Cameron Award for Patient Services in 2015. Courses & Syllabi Nephrology Elective (Consultation Service),, Bayview Medical Center, 1/1/15. Dr. Thavarajah is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are End-Stage Renal Disease (ESRD), Chronic Kidney Disease, Nephrosclerosis, and Renovascular Hypertension.

Navneet Ahuja is a Nephrologist in Catonsville, Maryland. Dr. Ahuja is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are Nephrosclerosis, Renovascular Hypertension, Acute Kidney Failure, and End-Stage Renal Disease (ESRD).

Mary Behrens is a Nephrologist in Catonsville, Maryland. Dr. Behrens is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are Nephrosclerosis, Renovascular Hypertension, Acute Kidney Failure, and End-Stage Renal Disease (ESRD). Dr. Behrens is currently accepting new patients.

Rudolf Pullmann is a Nephrologist in Catonsville, Maryland. Dr. Pullmann is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are Nephrosclerosis, Renovascular Hypertension, Acute Tubular Necrosis, and Acute Kidney Failure. Dr. Pullmann is currently accepting new patients.

Robert Fuld is a Nephrologist in Baltimore, Maryland. Dr. Fuld is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are Nephrosclerosis, Renovascular Hypertension, Vitamin D Deficiency, and Chronic Kidney Disease. Dr. Fuld is currently accepting new patients.

Dr. Luis F. Gimenez is an assistant professor of medicine at the Johns Hopkins University School of Medicine. His area of clinical expertise includes nephrology. Dr. Gimenez received his medical degree from Facultad de Medicina de la Universidad de Chile. He completed residencies in internal medicine at Hospital Clinico Regional Dr. Guillermo Grant Benavente, Hospital Carlos Van Buren and the Johns Hopkins School of Medicine. He performed his fellowship in nephrology at Johns Hopkins. His research interests include the pathophysiology of chronic renal failure. Dr. Gimenez is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. His top areas of expertise are End-Stage Renal Disease (ESRD), Chronic Kidney Disease, Acute Kidney Failure, and Minimal Change Disease.

Anita Pasumarthy is a Nephrologist in Baltimore, Maryland. Dr. Pasumarthy is rated as a Distinguished provider by MediFind in the treatment of Chronic Kidney Disease. Her top areas of expertise are Nephrosclerosis, Renovascular Hypertension, End-Stage Renal Disease (ESRD), and Chronic Kidney Disease.