A geriatric psychiatrist by training, Colenda is a member of the Liaison Committee for Medical Education, National Board of Medical Examiners, Accreditation Council for Graduate Medical Education, and American Board of Psychiatry and Neurology. He also serves on the Psychological Health External Advisory Subcommittee for the Defense Health Board at the U.S. Department of Defense, and the Administrative Board of the Council of Deans for the Association of American Medical Colleges.