Our Team of Transplant Specialists

Anthony Sebastian, MD

Dr. Sebastian is the founding director and chief of the Oklahoma Transplant Center at OU Medical Center. His transplant surgical training was completed at Mt. Sinai Medical Center, New York City, as part of the American Society of Transplant Surgeons accredited fellowship. He is a transplant and general/hepatobiliary surgeon specializing in liver, kidney and pancreas transplant surgery in adults and children. Dr. Sebastian is the most experienced liver surgeon in the state of Oklahoma, having performed hundreds of liver transplants and liver surgeries. Dr. Sebastian performed the first successful pancreas transplant in Oklahoma in 1995.


Harlan Wright, MD

Dr. Wright is the medical director of the liver transplant program at the Oklahoma Transplant Center. Dr. Wright received his medical degree from Universidad Central de Venezuela, completing his post-graduate gastroenterology training at the University Hospital of Caracas. He spent many years at the University of Pittsburgh Transplant Center and is published in many scientific journals. Dr. Wright treats patients with liver disease and patients who have undergone liver transplants.


Ben Cowley, MD

Dr. Cowley is the medical director for the adult kidney and pancreas transplant programs at the Oklahoma Transplant Center. He received his medical degree from Baylor College of Medicine in Houston, Texas, followed by further training in nephrology at the University of Kansas Medical Center. Following research training at the National Institutes of Health, Bethesda, Md., Dr. Cowley returned to Kansas University Medical Center as part of the kidney transplant program. He serves as the chief of nephrology and hypertension and the John Gammill Professor in Polycystic Kidney Disease at the University of Oklahoma Health Sciences Center. Dr. Cowley treats patients with kidney disease and those patients with kidney transplants.


Shi-Feng Li, MD

Dr. Li earned his medical degree and surgery residency from West China University of Medical Sciences. He also completed a transplant surgical fellowship at Integris. Dr. Li is a member of the American Society of Transplantation and the International Liver Transplantation Society. He has authored numerous peer review articles, as well as medical textbooks. Dr. Li joined the Oklahoma Transplant Center in the spring of 2010. Dr. Li serves as a procurement surgeon for the Oklahoma Transplant Center.


Hawxby Headshot

Alan Hawxby, MD

A native Oklahoman, Dr. Alan Hawxby is currently surgical director of the adult and pediatric kidney transplant programs and is the designated living donor surgeon at the University of Oklahoma. He received his medical degree from the University of Oklahoma, followed by a transplant surgery fellowship at The Johns Hopkins Hospital in Baltimore, Maryland, in 2004. Dr. Hawxby initially served as an assistant professor of transplant surgery at the University of Alabama in Birmingham, followed by an appointment as chief of the Division of Transplantation at the University of Mississippi in Jackson. Dr. Hawxby joined the Oklahoma Transplant Center in January 2011. His practice includes liver, pancreas and kidney transplantation; laparoscopic donor nephrectomy, general surgery, hepatobiliary surgery, and dialysis access surgery. He is Board Certified by the American Board of Surgery. His research interests include advanced  methods of evaluating organs for transplantation, and innovative approaches for expanding the number of organs available for transplantation.   He enjoys the team approach to transplantation and is passionate about providing hope to patients who struggle with organ failure.


Mani Vijayan, CNS

Ms. Vijayan earned her master's degree in advanced practice nursing from the University of Oklahoma College of Nursing. As a clinical nurse specialist, she has served the end stage renal disease community in both kidney transplant and urology. Ms. Vijayan was a member of the Transplant Services at St. Anthony Hospital and the Veterans Administration Hospital, Oklahoma City, prior to joining the Oklahoma Transplant Center in 2010 as the clinical director of the kidney and pancreas transplant programs.


Terry Green, NP

Ms. Green is an advanced registered nurse practitioner (ARNP), receiving an undergraduate degree from the University of Oklahoma and a master's in nursing degree from University of Texas. Terry's specialty is managing patients with chronic liver disease working closely with Drs. Wright and Kanagala. Terry was a member of the liver disease management team at Integris, prior to joining the Oklahoma Transplant Center in the spring of 2010 as the clinical director of the liver disease management program.