Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Daniel Callahan was born July 19, 1930. Callahan is a philosopher widely recognized for his innovative studies in biomedical ethics. In high school Callahan was a swimmer and choose to attend Yale University because of its competitive swimming program. While at Yale, he was drawn to interdisciplinary studies and graduated in 1952 with a double degree in English and Philosophy. He received a M.A from Georgetown University and earned a Ph.D. in philosophy from Harvard in 1965. In 1955 Callahan married Sidney DeShazo, who shared many of his intellectual interests in psychology, ethics, and human behavior. Sidney Callahan is a distinguished social psychologist, teacher, and syndicated columnist in moral psychology. They have six children, five boys and one girl. Daniel Callahan is a Senior Research Scholar and President Emeritus of the Hastings Center, a nonpartisan bioethics research institution he cofounded with Willard Gaylin in 1969