His clinical practice has focused on the medical and surgical treatment of corneal and external eye diseases, corneal transplantation, and ocular oncology. Over the course of his career, his research interests have included basic science and clinical studies of the optical performance of the cornea after keratorefractive surgery and clinical studies of the outcomes of corneal transplantation. He developed a curriculum in corneal microsurgery and has run Mayo Clinic’s wet lab instruction course in corneal transplantation for the past 15 years.