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 an Advanced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Atypical Hemolytic Uremic Syndrome (aHUS), D-Plus Hemolytic Uremic Syndrome, Hemolytic-Uremic Syndrome, Glomerulonephritis, and Kidney Transplant.

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

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

Learn more at marylandoncology.com. Dr. Sastry is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. Her top areas of expertise are Paget Disease of the Breast, Breast Cancer, Iron Deficiency Anemia, and Childhood Iron Deficiency Anemia.

Dr. Brian G. Johnson is the chief of interventional radiology at Sibley Memorial Hospital. Dr. Johnson practices out of Sibley Memorial Hospital in Washington, D.C., Suburban Hospital in Bethesda, MD and the Johns Hopkins Hospital in Baltimore, MD. Dr. Johnson graduated summa cum laude from University of Minnesota prior to earning his medical degree from Johns Hopkins University School of Medicine. He completed a residency in physical medicine and rehabilitation at Sinai Hospital of Baltimore, as well as a residency in diagnostic radiology at the University of Maryland Medical Center. Dr. Johnson also completed an interventional radiology fellowship at Johns Hopkins University. Dr. Johnson has been repeatedly named a Top Doctor by Washingtonian Magazine, as well as a Top MD by Consumers' Checkbook Magazine. He is a member of the American College of Radiology and the Society of Interventional Radiology. Videos Brian Johnson, M.D.Interventional Radiology Selected Publications Neuromodulatory effect of the atrial natriuretic factor clearance receptor binding peptide, cANF(4-23)-NH2 in the rabbit isolated vas deferentia, Johnson BG, Trachte GJ, Drewett JG, J Pharm & Exp Ther - 1/1/1991 Percutaneous Management of Renal and Renal-Pancreas Transplant Recipients Using CT Fluoroscopy: A Two Year Experience. Krebs TL, Johnson BG, Daly BD, Wong-You-Chong JJ, Bartlett ST, Radiological Society of North America Meeting, Chicago, IL - 1/29/1998 The hexagonal cell nitinol intravascular stent: a comparison of the effects of varying the stent wire gauge on the aorta and inferior vena cava in the swine animal model. Kuo J, Johnson BG, Venbrux AC, Olson JL, Samphilipo MA, Magee CA, Kobelja MA, Anderson JH, Osterman FA, American Roentgen Ray Society Annual Meeting, New Orleans, LA - 1/24/1994 The role of anticoagulation in the setting of a tethered vena cava filter in the swine animal model. Johnson BG, Reichle RL, Venbrux AC, Samphilipo MA, Magee CA, Anderson JH, Osterman FA, Society for Cardiovascular and Interventional Radiology Annual Meeting, Fort Lauderdale, FL - 1/1/1995. Dr. Johnson is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Pancreatic Cancer, Familial Pancreatic Cancer, Bile Duct Obstruction, Vertebroplasty, and Bone Graft.

Dr. Syed joins the Community Radiology Division from Eastern Radiologists in Greenville, NC where he also served as an Affiliate Associate Professor of Radiology at the Brody School of Medicine at East Carolina University. He received his Medical degree from Drexel University College of Medicine. Dr. Syed completed his radiology residency at Tufts Medical Center, followed by a Cross-sectional Body Imaging fellowship at The Johns Hopkins Hospital. Dr. Syed also has a M.S. in Pharmacology and Experimental Therapeutics from the University of Maryland School of Medicine. Dr. Syed is a radiologist with subspecialty expertise in gastrointestinal and genitourinary imaging. Dr. Syed is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Pleural Effusion, Pleurisy, Collapsed Lung, and Angiomyoma.

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 an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. Her top areas of expertise are End-Stage Renal Disease (ESRD), Chronic Kidney Disease, Nephrosclerosis, and Renovascular Hypertension.

Dr. Georgiades earned a series of degrees (BSc-Mechanical Engineering, MS & PhD-Radiological Sciences and an MD). He received a 1-year training in Internal Medicine at Harvard and subsequently, completed subspecialty training at Johns Hopkins in Diagnostic and Interventional Radiology. He has been a full time faculty at Johns Hopkins since 2003 (except for a 3 year hiatus 2012-2015 when he set up a private practice overseas). He has held various positions including fellowship director, clinical director and was a member of many Departmental and Institutional committees. He is a prolific researcher with more than 100 manuscripts, more than 100 abstracts, 28 book chapters and numerous presentations at national and international fora. Dr. Georgiades is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Fibrolamellar Carcinoma, Bile Duct Obstruction, Neuroendocrine Tumor, Liver Embolization, and Gastrostomy.

Piamsook Angkeow is a Cardiologist and a Cardiac Electrophysiologist in Elkton, Maryland. Dr. Angkeow is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Atrial Fibrillation, Familial Progressive Cardiac Conduction Defect, Angina, Pacemaker Implantation, and Cardiac Ablation.

Dr. Steven A. Burka is a nephrologist affiliated with Sibley Memorial Hospital and Suburban Hospital. He has a private practice in Chevy Chase, Md. Dr. Burka earned his medical degree from George Washington University School of Medicine. He completed a residency in internal medicine at Beth Israel Medical Center, followed by residencies in nephrology at Bellevue Hospital Center and New York University Medical Center. Dr. Burka was named a Top Doctor in the Washington, D.C. and Washington-Baltimore areas by Castle Connolly in 2012. Videos 2017 Best Consulting Physician at Sibley Memorial Hospital - Steven Burka, M.D. Dr. Burka is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Chronic Kidney Disease, High Potassium Level, End-Stage Renal Disease (ESRD), and Low Sodium Level.

Ajay Kumar is a Nephrologist in Columbia, Maryland. Dr. Kumar is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Acute Kidney Failure, Nephrosclerosis, Renovascular Hypertension, and Acute Tubular Necrosis.

Ziad Khoury is a Nephrologist in Chevy Chase, Maryland. Dr. Khoury is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Acute Kidney Failure, End-Stage Renal Disease (ESRD), Chronic Kidney Disease, and Hypercalcemia.

Robert Benitez is a Cardiologist in Baltimore, Maryland. Dr. Benitez is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Mitral Valve Regurgitation, Necrosis, Cardiogenic Shock, Transcatheter Aortic Valve Replacement (TAVR), and Aortic Valve Replacement.

Dr. Dennis A. Cullen is an internist affiliated with Sibley Memorial Hospital. He practices out of Cullen, Umosella, Cullen & Cullen in Bethesda, Md. and Oxon Hill, Md. Dr. Cullen earned his medical degree from Georgetown University School of Medicine. He completed a residency in internal medicine at Georgetown University Hospital. Dr. Cullen has been named a Top MD by Consumers’ Checkbook Magazine, as well as a Top Family/General Practitioner and a Top Internist by Washingtonian Magazine. Recent News Articles and Media Coverage The Brothers Cullen. Bethesda Magazine (January/February 2008). Dr. Cullen is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Multiple Carboxylase Deficiency, Vitamin B12 Deficiency Anemia, Folate Deficiency, and Subacute Combined Degeneration.

Vivek Varma is a Cardiologist in Elkton,, Maryland. Dr. Varma is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Coronary Heart Disease, Angina, Atherosclerosis, Pacemaker Implantation, and Angioplasty.

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

Misha Varma is a Nephrologist in Columbia, Maryland. Dr. Varma is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. Her top areas of expertise are Nephrosclerosis, Renovascular Hypertension, High Potassium Level, and Acute Kidney Failure.

Niteen Milak is a Cardiologist in Bel Air, Maryland. Dr. Milak is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Familial Neurocardiogenic Syncope, Fainting, Atrial Fibrillation, and Heart Attack.

Cassius Belfonte is a Cardiologist in Prince Frederick,, Maryland. Dr. Belfonte is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Familial Neurocardiogenic Syncope, Pediatric Myocarditis, Arrhythmias, Heart Failure, and Pacemaker Implantation.

Faisal Adhami is a Hematologist Oncology specialist and a Hematologist in Elkton, Maryland. Dr. Adhami is rated as an Experienced provider by MediFind in the treatment of Acute Arterial Occlusion of Kidney. His top areas of expertise are Familial Colorectal Cancer, Colorectal Cancer, Childhood Iron Deficiency Anemia, and Melanoma.