Few people achieve distinction in their careers. Dr Mark L. Dyken has excelled in many—clinician, teacher, investigator, leader, editor—all at a superb level. Dr Dyken’s professional life began and continues as a masterful and compassionate clinician who loves teaching. Remarkably, 4 medical school classes at Indiana University voted him Outstanding Professor, and the university conferred upon him the Glen W. Irwin, Jr, MD Distinguished Faculty Award in 1994. Internationally, he has been honored by hundreds of visiting professorships, including 14 named lectureships and being named Professor Ad-Honorem at the University of Uruguay. As an investigator, he led the first prospective controlled …