He is a professor of psychiatry at Harvard Medical School and Massachusetts General Hospital.
He has been the team psychiatrist to the New England Patriots.
He is a board member of the Family Research Council.
He is editor and coauthor of "The Harvard Guide to Psychiatry," and author of "The Question of God: C.S. Lewis and Sigmund Freud Debate God, Love, Sex, and the Meaning of Life," which was the basis for a PBS program.
He has been a consultant to government organizations and corporations.