He received his medical degree from the University of Chicago Pritzker School of Medicine, Illinois, and he completed a one-year internship at Washington University, St. Louis/Barnes - Jewish Hospital, Missouri. Dr. Kohlbrenner completed his four-year diagnostic radiology residency at the University of California, San Francisco and served as chief resident in his senior year. He subsequently completed his Interventional Radiology fellowship at University of California, San Francisco.