All of our doctors at Gastroenterology Associates are Board Certified in Internal Medicine and Gastroenterology.
William C. Haynes, M.D.
A true West Texan, Dr. Haynes was raised in Merkel where watching his grandfather, Dr. Sadler practice medicine, he was influenced to become a physician. He graduated from Cooper High School in Abilene. He obtained his medical degree from the University of Texas Medical Branch at Galveston and continued with training internal medicine. He attended the University of Arizona Veterans Administration Medical Center in Phoenix, Arizona.
Gary Roark, M.D.
Born in Graham, Texas, Dr. Roark received his medical degree from the University of Texas Medical Branch in Galveston and also his internal medicine. His Gastroenterology fellowship was at the University of Utah. He was Assistant Professor of Internal Medicine at the University of Texas Medical Branch.