Nephrologists

Karthik M Ranganna, MD, MBA, FASN, FACHE

Medical Director, Kidney Transplant, Tower Health Transplant Institute Associate Professor of Medicine, Drexel University College of Medicine

Karthik Ranganna, MD, MBA, FASN, FACHE, specializes in chronic kidney disease, end stage renal disease, dialysis, hypertension, and transplant. His clinical and research interests include living donor transplant, kidney transplant in HIV infected patients, combined organ transplant and novel immunosuppression and improving equitable access to transplantation.

He leads the kidney transplant program from the medical side and will care for pre and post-kidney transplant patients and patients with other solid organ transplants with kidney problems.

He has served in the United Network of Sharing Pancreas Committee and is the recipient of the Kidney Honors Award for Clinical Excellence from the National Kidney Foundation.

Dr. Ranganna is certified by the American Board of Internal Medicine in Nephrology and in Internal Medicine.

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Meera N Harhay, MD, MSCE, FASN

Transplant Nephrologist, Tower Health Transplant Institute Associate Professor of Medicine, Drexel University College of Medicine, Drexel University Dornsife School of Public Health Associate Professor of Epidemiology and Biostatistics, Drexel University Dornsife School of Public Health

Dr. Meera Nair Harhay, MD, MSCE, FASN, is a transplant nephrologist and clinical epidemiologist. Her clinical and research interests include the impacts of kidney disease on physical function, cognitive function, obesity, and metabolism. Dr. Harhay is dedicated to examining social determinants of kidney disease outcomes, and to efforts that aim to improve access to kidney transplantation. She also works closely with a multidisciplinary team of bioengineers and statisticians to develop technologies to improve dialysis and transplant care.

Dr. Harhay earned her medical degree from the University of Pennsylvania. She then completed Internal Medicine Residency and Nephrology Fellowship at the Hospital of the University of Pennsylvania. Subsequently, Dr. Harhay completed an American Society of Transplantation (AST) accredited Kidney Transplant Fellowship at the University of Pennsylvania. She also earned a Master’s Degree in Clinical Epidemiology and Biostatistics from the Center for Clinical Epidemiology and Biostatics at the University of Pennsylvania.

Dr. Harhay’s research is supported by grants from the National Institutes of Health (NIH) and the Commonwealth Universal Research Enhancement Program.

Dr. Harhay is certified by the American Board of Internal Medicine in Nephrology and in Internal Medicine.

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Lissa B Levin Mizrahi, MD

Transplant Nephrologist, Tower Health Transplant Institute Assistant Professor of Medicine, Drexel University College of Medicine

Lissa Levin Mizrahi, MD, is a board-certified nephrologist. As part of the kidney transplant program, she cares for pre- and post-kidney transplant patients at Tower Health Transplant Institute. She leads the team on inpatient rounds for kidney transplant patients, as well as other transplant patients with renal issues.

She earned her medical degree from Temple University School of Medicine. Dr. Mizrahi completed a Residency in Internal Medicine at Thomas Jefferson University Hospital and a Fellowship in Nephrology at Hahnemann University Hospital/Drexel University College of Medicine.

Dr. Levin Mizrahi is certified by the American Board of Internal Medicine in Nephrology and in Internal Medicine.

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Transplant Surgeons

Stephen R Guy, MD, FACS

Director, Kidney Transplant, Tower Health Transplant Institute Associate Professor, Drexel University College of Medicine

Stephen Guy, MD, FACS, is a kidney and liver transplant surgeon with over 25 years of experience specializing in multi-organ transplant.

He was instrumental in developing laparoscopic living donor nephrectomy for kidney transplant, a minimally invasive surgery for individuals donating a kidney. Dr. Guy is also experienced in performing transplants for high-risk patients, providing long-term healthcare following a transplant and in general surgeries of the pancreas, liver and other laparoscopic surgeries.

Before coming to Tower Health, Dr. Guy developed and led several liver and kidney transplant programs in the Philadelphia area. He serves on the medical advisory board of the Gift of Life Donation Program and has recently served, at the national level, on the Kidney Committee of UNOS.

Dr. Guy is also active internationally. He and his team have initiated several renal transplant programs in developing countries that had no previous transplant programs and limited dialysis. He has published in peer review journals on these international surgical missions.

He earned his medical degree from Boston University and completed a Residency and Internship in Surgery at Beth Israel Medical Center, where he was also named Chief Resident in Surgery. Dr. Guy completed a Fellowship in Transplantation at Mount Sinai Medical Center.

Dr. Guy is certified by the American Board of Surgery and is a Fellow of the American College of Surgeons.

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David J Reich, MD, FACS

Medical Director, Tower Health Transplant Institute System Chief, Multiorgan Transplant and Hepatobiliary Surgery, Tower Health Professor of Surgery, Drexel University College of Medicine

David Reich, MD, FACS, is an internationally recognized leader in organ transplant and hepatobiliary (HPB) surgery, He specializes in liver and kidney transplant, complex liver surgery, treatments for liver tumors, and transplant of high-risk patients.

Dr. Reich has expertise as a clinician, administrator, educator and scientist. He has published extensively and lectured internationally regarding research initiatives and clinical care. He is investigating innovative technologies for organ preservation, including machine perfusion of donor organs. He is an authority on a wide spectrum of healthcare governance and practice, including quality improvement, practice standards, healthcare economics, value-based care, strategic development, leadership development, legislative and regulatory advocacy, and medical education and training.

Dr. Reich serves in numerous national leadership roles, including as immediate past treasurer of the United Network for Organ Sharing (UNOS, 2017-2019); UNOS manages the U.S. organ transplant network by contract with the federal government. He has been a member of the UNOS Board of Directors, chaired the Finance Committee and the Information Technology Committee, served on the Executive Committee, Corporate Affairs Committee, Membership and Professional Standards Committee and Liver and Intestinal Organ Transplant Committee, and was councilor for Region 2. Dr. Reich is chair of the Quality and Pay Reform MACRA Task Force and past chair of the Standards Committee and of the Legislative Committee of the American Society of Transplant Surgeons. He is an Associate Editor of Clinical Transplantation and was a member of the Editorial Board of Liver Transplant.

Dr. Reich is certified by the American Board of Surgery and is a Fellow of the American College of Surgeons. He received his bachelor’s degree from Columbia University and medical degree from McGill University. He performed his surgical residency at Beth Israel Medical Center and completed his American Society of Transplant Surgeons approved Multiorgan Transplant and HPB Surgery Fellowship at the renowned Mount Sinai Recanati/Miller Transplant Institute in New York City. He has practiced surgery in Philadelphia since 1996. He is a Castle Connolly and Philly Magazine "Top Doc," featured 2010 - 2019.

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Gary Xiao, MD, FACS

Director, Liver Transplant, Tower Health Transplant Institute Assistant Professor of Surgery, Drexel University College of Medicine

Gary Xiao, MD, FACS specializes in liver and kidney transplant and hepato-pancreato-biliary (HBP) surgery. He is highly experienced in laparoscopic and open liver resection, liver tumor ablation and pancreatic surgery and resection, especially in very complicated and challenging cases.

Dr. Xiao is a United Network for Organ Sharing-certified laparoscopic living donor nephrectomy surgeon. He is an American Society of Transplant Surgeons certified liver and kidney transplant surgeon. He serves on the Regulatory and Reimbursement Committee of the American Society of Transplant Surgeons.

He earned his medical degree and a Master of Medicine in Kidney Transplantation from Henan Medical University, Zhengzhou, Henan, China. Dr. Xiao completed a Urology Residency and a Transplant Fellowship at The First Teaching Hospital of HMU, Zhengzhou, Henan, China. He completed a Clinical Transplantation Fellowship at Albany Medical College was a Surgical Resident at MCP Hahnemann University/Drexel University College of Medicine. Dr. Xiao completed a Fellowship in Multi-Organ Transplantation and Hepato-Biliary Surgery from the University of Pittsburg Medical Center.

Dr. Xiao is also certified by the American Board of Surgery and is a Fellow of the American College of Surgeons. He has conducted pivotal clinical and translational research on liver cancer and published and lectured internationally.

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