A direct descendent of Paul Revere, William Christopher was destined for his own fame. He attended Wesleyan University where he majored in drama. Christopher made his Broadway debut in Beyond the Fringe.
He soon left the New York for Hollywood and landed work in several well-known series including Gomer Pyle, U.S.M.C., That Girl and Hogan's Heroes, where he had recurring roles. He also landed work in feature film, starring in: The Shakiest Gun in the West, The Fortune Cookie and With Six You Get Egg Roll, where he appears with M*A*S*H co-star Jamie Farr five years before the show.
In 1972, he won what would become his best known role as Father Francis Mulcahy in the TV series M*A*S*H. On the show for the entire run, his character evolved from a shy priest trying to bring a sense of faith and spirituality during war to a respected friend and invaluable member of the 4077th.
After the show ended he appeared in the short-lived spin-off series After M*A*S*H and has appeared in other television series including Murder She Wrote, Mad About You and Diagnosis Murder.
Father Francis Mulcahy is a former amateur boxer, now U.S. Army chaplain assigned to the 4077th Mobile Army Surgical Hospital during the Korean War. He mixes spirituality with the cold hard facts of life and war - and in doing so, becomes a respected leader and a reliable friend.
Father Mulcahy initially comes into the unit with his own set of challenges. He finds it hard for his spirituality to be taken seriously by a staff embedded in the ugliness of war. Yet he soon learns what it means to be in true service to others. From serving as an orderly during a food poisoning outbreak to performing an emergency tracheotomy while under enemy fire, he gradually gains the respect of the troops.
Father Mulcahy proves himself an everyday man and is often found playing piano, drinking at the Officers Club and occasionally playing poker - although he donates all of his winnings to charity. Though he is a Roman Catholic, he gladly ministers to all faiths. He is eventually promoted to Captain after Colonel Potter intervenes on his behalf.