Dr. Mary Van Hal has been a board-certified internal medicine physician since 1983, and has been caring for Keller families since 1997. Her experience also includes emergency medicine, orthopedic back care and medical missionary work in Nigeria, Juarez, Mexico and El Paso, Texas. Dr. Van Hal has been married to her husband, who is also a physician, for more than 40 years. Together, they have raised two daughters and two sons.