Dr. Schellpfeffer is also Medical Director of Sioux Falls Surgical Hospital , LLP, which he co-founded in 1985, and President, Anesthesia Associates, the largest anesthesia services provider in South Dakota. As an original founder of the Sioux Falls Surgical Hospital , Dr. Schellpfeffer has been its Medical Director and a member of the Management Committee since 1985. He has over 18 years of experience in ambulatory surgical environments, and 22 years in general, cardiovascular, and trauma practices and has also authored numerous medical publications. Dr. Schellpfeffer received a Bachelor of Science from the University of Wisconsin; a Masters of Science, a Bachelor of Science from the College of Veterinary and Medicine and a Ph.D. in animal physiology, each from the University of Minnesota and his M.D. from University of South Dakota School of Medicine. He completed his residency in Anesthesiology in Wisconsin.