Barr's father was Jewish and raised in Judaism but later converted to Christianity and joined the Catholic Church. His mother is of Irish ancestry. Barr was raised as a Catholic. Barr was the second of four sons, and his younger brother Stephen Barr is a professor of physics at the University of Delaware.

Born: May 23, 1950, New York City

Spouse: Christine Moynihan Barr

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William Barr - Wikipedia