Wiesner joined the Estes Park Family Medical Clinic in Estes Park, CO. He completed a pediatric internship at Blank Children’s Hospital in Des Moines and a pediatric residency at the University of Colorado Health Sciences Center’s Children’s Hospital in Denver. He is board-certified by the American Board of Pediatrics. Prior to joining the staff at Estes Park, Wiesner practiced with Loveland Pediatrics in Loveland, CO. His other appointments include associate clinical professor of pediatrics (University of Colorado Health Sciences Center – Children’s Hospital in Aurora, CO), clinical associate professor of pediatrics (Kansas City University of Medicine and Biosciences in Kansas City, MO) and adjunct clinical assistant professor of pediatrics (Touro University College of Osteopathic Medicine in Vallejo, CA). The University of Colorado recognized him with the Outstanding Clinical Faculty Instructor Award for his work educating medical students and residents. Wiesner is married with four children.