Dr. Thielen graduated from Texas A&M College of Veterinary Medicine in 2013. From there, she completed an internship at Broward Avian and Exotic Animal Hospital in Florida and then an ABVP avian residency at the Veterinary Center for Birds & Exotics in New York. After her training she became the founding Medical Director of Texas Avian & Exotic Hospital in Grapevine, Texas. Dr. Thielen became a Diplomate of the American Board of Veterinary Practitioners in avian practice in 2020. She serves as an adjunct professor for University of Miami within the Miller School of Medicine Comparative Pathology, Avian and Wildlife laboratory providing clinical pathology case consultations.