Known for his work in the field of biomedical ethics, Callahan penned such healthcare-themed philosophical works as Setting Limits: Medical Goals in an Aging Society; What Kind of Life: The Limits of Medical Progress; and Abortion: Law, Choice and Morality. He attended Yale University, where he studied philosophy and English and had a collegiate swimming career. He went on to earn a master's degree from Georgetown University and a doctorate from Harvard University.
