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Principal Investigators

Stephen Harrison, MD

Founder & Chairman of the Board
San Antonio, TX

Specialty: Gastroenterologist & Hepatologist Specializing in Liver Disease
Education: University of Mississippi School of Medicine, 1995
Residency: Internal Medicine at Brook Army Medical Center, 1998

  • Gastroenterology at Brook Army Medical Center, 2002
  • 4th Year Advanced Liver Disease Fellowship at Saint Louis University, 2003

Practicing Since: 1995
Certifications/Publications: Board certified in Internal Medicine and Gastroenterology. Published more than 300 papers in liver disease.

Provider Quote: My goal and purpose as a Hepatologist is to ensure we have impactful treatments for patients suffering from liver disease to include Non-Alcoholic Fatty Liver Disease and Non-Alcoholic Steatohepatitis.

Provider Background: Dr. Harrison most recently served as a Colonel in the United States Army, retiring in 2016, he concluded 20 years of dedicated service to his country. During his Army tenure, he served as:

  • Director of Army Graduate Medical Education at Brooke Army Medical Center
  • Associate Dean for the San Antonio Uniformed Services Health Education Consortium, Gastroenterology Consortium.
  • Gastroenterology Consultant to the Army Surgeon General.

With over 20 years in the industry, Dr. Harrison has formed a multitude of global and local relationships with like-minded physicians and experts to raise awareness of liver disease and find a treatment for the patients that need it most.

Madhavi Rudraraju, MD

Medical Director & Physician Investigator
San Antonio, TX

Specialties: Gastroenterology and Transplant Hepatology
Education: Andhra Medical College, 2001
Residency: University of Oklahoma Health Sciences Center, 2006
Transplant Hepatology at Mayo Clinic – Arizona, 2007
Gastroenterology and Hepatology at University of Oklahoma Health Science Center, 2010

Practicing Since: 2010
Certifications/Publications: Over 6 original publications in peer-reviewed journals and 4 publications worldwide. 3 board certifications, and over 2 years of research support in the areas of Non-Alcoholic Fatty Liver Disease.

Provider Background: Dr. Rudraraju is a board certified hepatologist with over 12 years of practice. Throughout her career she has had tremendous positions, including:

Medical Director of Methodist Liver Disease and Transplant Program VNOS Director
Medical Executive Committee as Chief of Transplant service line
Clinical Review Committee
Physician Advisory Committee
Active member of American Medical Association, American College of Gastroenterology, American Gastroenterology Association, and the American Association for the Study of Liver Disease, and European Association for the Study of the Liver (EASL).

Dr. Rudraraju has been with Pinnacle since 2020 and has formed a multitude of relationships with San Antonio’s physicians and experts to raise awareness of liver disease and find a treatment for the patients that need it most.

Jacques Benun, MD

Physician Investigator
Austin & Georgetown, TX

Specialty: Pediatrics, Research
Education: Central University of Venezuela, 1992
Residency: Boston University School of Medicine, 1995
Chief Residency: Boston University School of Medicine, 1996

Practicing Since: 1992
Certifications/Publications: 9 original publications in peer-reviewed journals, 10 licensed certifications, and over 16 years of research support in the areas of pediatric research.
Provider Quote: Striving to provide cutting-edge clinical research to our patients in the Austin and surrounding communities.
Provider Background: Dr. Benun first moved to Texas in 2017, bringing with him over 20 years of medical experience. Throughout his physician years, he has been:
  • A professor in Pediatrics at Alpert Medical School of Brown University
  • Clinical Associate Professor of Dell Medical School at the University of Texas in Austin
  • Research supporter in the Pfizer COVID vaccine study in children 5-11 years’ old