Input (grade 13): William Christopher (born October 20, 1932) is an American actor who is best known for playing Father Mulcahy on the television series M \* A \* S \* H and Private Lester Hummel on Gomer Pyle, U.S.M.C.
Output (grade 6): He is an American actor. He is most well known for playing Father Mulcahy on the television series M \* A \* S \* H/O. He also played Private Lester Hummel on Gomer Pyle, U.S.M.C. His wife's name is Barbara O'Connor; together they wrote a book, Mixed Blessings, about their experiences raising their autistic son.