Peter Killian Gallagher (born August 19, 1955) is a Golden Globe- and SAG-winning American actor, musician and writer.
Gallagher was born in New York City, New York, the son of Mary, a bacteriologist, and Tom Gallagher, an advertising executive. He is of Irish Catholic background and was raised in Armonk, New York. Gallagher graduated from Tufts University, where he was very visible in the performance scene on campus, appearing in such shows as Stephen Sondheim's Company and singing with the all-male a cappella group the Beelzebubs.


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