These areas are among his clinical interests: eyelid surgery, thyroid cancer, and thyroid surgery. Dr. Theilen is affiliated with Baylor Scott & White Health. He studied medicine at the University of Texas Medical Branch School of Medicine. He has received a 4.0 out of 5 star rating by his patients. Dr. Theilen is in-network for several insurance carriers, including Blue Cross/Blue Shield, Blue Cross Blue Shield Bronze, and Blue Cross Blue Shield Gold. He has received the following distinction: Texas Super Doctors.