Featured Chronic Kidney Disease (CKD) Investigators

DaVita Clinical Research has an extensive network of more than 150 investigator physicians at 250+ sites. Our premier network of investigators includes these physicians with extensive experience conducting trials in patients across all stages of chronic kidney disease (CKD). For your next renal trial, contact DCR to discuss how you can benefit from DCR: our data-driven process for establishing trial design, feasibility, and execution, and these leading investigator physicians.


Fahd Al-Saghir, MD

Michigan Kidney Consultants, PC, Pontiac, MI

Dr. Al-Saghir currently serves as Clinical Assistant Professor, Department of Internal Medicine, at Michigan State University College of Osteopathic Medicine and served for nine years as Chairman of the Pharmacy and Therapeutics Committee at St. Joseph Mercy Oakland Hospital in Pontiac. He has more than 10 years clinical trial experience and has been principal investigator on more than 30 trials in patients with chronic kidney disease or end stage renal disease. Dr. Al-Saghir received his MD at Aleppo University Medical School in Aleppo, Syria, and additional training at Henry Ford Hospital in Detroit and holds an ACRP certification.


Stephen-Zale-FademStephen Zale Fadem, MD, FACP, FASN

Kidney Associates, PLLC, Houston, TX

Dr. Fadem has been named one of “America’s Top Doctors” by US News & World Report every year since 2010, and served as a member of the National Medical Advisory Board for the National Kidney Foundation from 1998 to 2004. He has been very active in the National Kidney Foundation of Southeast Texas, serving as Chairman of the Medical Advisory Board, Fundraising Chairman, Vice-President, and Chairman of the Stephen Z Fadem Update Symposium, and receiving a Lifetime Achievement Award in 2004. He has authored more than 160 publications, abstracts, presentations, and patient education articles, and has conducted clinical research in patients with CKD, ESRD, hypertension, and diabetic nephropathy. Dr. Fadem completed his MD at University of Oklahoma Medical School and completed additional training at the University of Texas Medical School at Houston Affiliated Hospitals and the University of Texas Science Center at San Antonio.


Joseph JC Lee, MD, JD, MBA

Apex Research of Riverside, Riverside, CA

Dr. Lee currently serves as Clinical Professor, Dept. of Medicine, at University of California, Irvine and as Medical Director for both the Home Hemodialysis Program and PD Central (Peritoneal Dialysis Program) at Nephrology Associates Medical Group in Riverside.  Previously he has held positions as President of Medical Staff at Riverside Community Hospital and President of Riverside County Medical Association.  He has been an investigator on more than 90 industry-sponsored clinical trials in therapeutic areas and devices including Type 2 diabetes, diabetic nephropathy, hypertension, chronic kidney disease, dialysis management and gout. Dr. Lee received his MD from National Taiwan University, then Internal Medicine and Nephrology training from Hahnemann Medical College, Philadelphia General Hospital, and Georgetown University Hospital.  In addition, he received his Healthcare MBA from the University of California at Irvine, and his JD from the California Southern Law School


Robert Isaac Lynn, MD

Nephrology and Hypertension Associates, Bronx, NY

In addition to his private practice at Nephrology and Hypertension Associates, PC, in the Bronx in New York, Dr. Lynn also serves as Medical Director at Bronx Dialysis Center, Bronx at Home Dialysis, and Eastchester Road Dialysis Center in the Bronx. Previously he served as Medical Director at the Baumritter Kidney Center, Albert Einstein College of Medicine Bronx, NY, and has served on the editorial board for Seminars in Dialysis and The Kidney. He is a board member of the American Nephrology Council and has been cited twice by the New York Magazine as one of the “Best Doctors in New York for Nephrology.” Dr. Lynn received his MD from Columbia University and completed additional training at Presbyterian Hospital in New York and Yale University.


K. Adu Ntoso, MD, FACP

Pennsylvania Nephrology Associates, Philadelphia, PA

Dr. Ntoso currently serves as Chief, Section of Renal Diseases and Hypertension, at Pennsylvania Hospital/University of Pennsylvania Health System. He has served as principal investigator on more than 20 trials in patients with CKD, and has been recognized as a “Top Doc” by Philadelphia Magazine. His awards include the Edward Viner Teaching Award at Pennsylvania Hospital, the Dialysis Patient Citizens William J Kolff Award for dedication to patients and optimal care, and the DaVita HealthCare Partners Award for Physician Leadership. Dr. Ntoso received his BSc from MIT and his MD from Albert Einstein College of Medicine.


John A Robertson, MD

Apex Research of Riverside, Riverside, CA

Dr. Robertson is currently in private practice at Nephrology Associates Medical Group in Riverside and also serves as Vice President of Clinical Services at DaVita Kidney Care. He has been an investigator on more than 90 industry-sponsored clinical trials since 2002 involving patients with conditions including hypertension, sepsis, Type 2 diabetes, and chronic kidney disease, and has numerous publications in peer-reviewed journals. He received his BS from the University of Redlands in California and his MD from the University of Oklahoma College of Medicine, and completed his nephrology fellowship at the University of California in Los Angeles.


David A Roer, MD, FACP, FASN, FASH

Nephrology and Hypertension Associates, Middlebury, CT

Dr. Roer currently serves as an Associate Clinical Professor of Medicine at Yale University School of Medicine, as well as Managing Partner at Nephrology and Hypertension Associates, PC, in Middlebury, CT. In addition to serving as principal investigator on more than 20 trials, he was a multiple-year winner of the Yale University Primary Care Residency Program Teacher of the Year award, and winner of the NKF Foundation of Connecticut Patient Advocacy Award and Gift of Life Community Service Award. He developed an exchange program between St. Mary’s Hospital and Kazan University Medical School in Russia and helped establish the Yale-Uganda Medical Alliance. Dr. Roer received his BSc from Syracuse University, his MD from Ross University School of Medicine, and post-doctoral training at Yale University.


Chao H Sun, MD, MPH

Apex Research of Riverside, Riverside, CA

Dr. Sun is currently in private practice at Nephrology Associates Medical Group in Riverside and is also a transplant nephrologist at St. Bernadine Medical Center in San Bernardino, CA. He has been an investigator on more than 90 industry-sponsored clinical trials in therapeutic areas including Type 2 diabetes, diabetic nephropathy, hypertension, chronic kidney disease, and gout. Dr. Sun received his MD from Kaohsiung Medical College in Taiwan and his MPH from Johns Hopkins University, with additional training at Kingsbrook Jewish Medical Center in Brooklyn, Harbor UCLA Medical Center, and Beth Israel Hospital, Harvard University.


Steven Zeig, MD

Pines Clinical Research, Pembroke Pines, FL

Dr. Zeig is currently in private practice at Pines Clinical Research. He has been principal investigator on more than 80 trials since 2008 involving patients with hypertension, Type 2 diabetes, diabetic nephropathy, chronic kidney disease, and osteoarthritis. Dr. Zeig received his BA from the City University of New York and his MD from the University of Ghent, Belgium, and completed additional training at Kings County Hospital in Brooklyn and Mt. Sinai Hospital in Hartford, CT.