Dr. Mumper graduated magna cum laude from Bridgewater College with a degree in General Science. She attended the Medical College of Virginia, did residency training at the University of Massachusetts and University of Virginia, and was invited to serve as Chief Resident of Pediatrics at UVA.

She spent five years in practice at F Read Hopkins Pediatrics in Lynchburg. She spent over a decade as Director of Pediatric Education at the Lynchburg Family Practice Residency Program. She maintained a clinical faculty appointment at the University of Virginia for 16 years. She served as Medical Director of the Autism Research Institute for five years. She is currently on the faculty of MAPS (Medical Academy for Pediatric Special Needs), and teaches for Intersect for Kids. She is on the Medical Advisory Board for TACA (Talk About Curing Autism).