Dr. Horst graduated from the University of California, San Francisco School of Medicine in 1974. He works in Wellesley Hills, MA and 1 other location and specializes in Gastroenterology. Dr. Horst is affiliated with Beth Israel Deaconess Hospital Needham, Beth Israel Deaconess Medical Center West Campus, Metrowest Medical Center, Mount Auburn Hospital and Newton-Wellesley Hospital.