Mark Heller. After studying kinesiology and athletic training, Jeff earned his Bachelor of Science in Physician Assistant Studies in 2005 from the University of Wisconsin-Madison. Jeff later earned his Masters of Physician Assistant Studies in 2010 from the University of Nebraska. Jeff relocated to the Twin Cities in 2006. He is experienced in hip and knee joint replacement, and has a specific interest in chronic degenerative conditions associated with the hip and knee. Jeff currently assists Dr. Heller in surgical procedures and runs independent clinics.