Dr. Hafeli received a BSc degree in Pharmacy at the Federal Institute of Technology in Zurich, Switzerland in 1986 and a PhD from the Paul Scherrer Institute in Villigen, Switzerland in 1989. He spent 1.5 years as a postdoctoral fellow at the Joint Center of Radiation Therapy at Harvard University, followed by 11 years as a research scientist in the Radiation Oncology Department of the Cleveland Clinic Foundation.