Born in Waterbury, Connecticut, Freeman studied classical piano in college and earned a Bachelor of Music degree from the University of Hartford. After serving in World War II, he joined Tex Beneke's big band, eventually leaving to perform as a pianist and later a comic in nightclubs.
Freeman's work as a studio musician included sessions with Frank Sinatra, Peggy Lee, Ella Fitzgerald, Percy Faith, Mabel Mercer, Charlie Parker, and Rosemary Clooney, for whom he played harpsichord on her hit "Come on-a My House."
Freeman's first Broadway project was the 1964 Buddy Hackett vehicle I Had a Ball. He also composed the score for Lovely Ladies, Kind Gentlemen, the short-lived 1970 musical adaptation of The Teahouse of the August Moon.
Freeman's television work included composing special musical material for Carol Burnett and Mary Tyler Moore. With Arthur Malvin he shared the Emmy Award for Outstanding Achievement in Special Musical Material for the mini-musical Hi-Hat performed by Burnett with guest Fred Astaire on the January 8, 1978 episode of her eponymous television variety series.
Freeman's solo recordings include Piano Sweethearts, Piano Moods, Come on-a Stan's house: Stan Freeman at the Harpsichord, Fascination, Manhattan, At the Blue Angel, and Everybody's Twistin'.
- Bruce Eder (2008). "Stan Freeman". Verve Records. Retrieved 2008-06-19.
- "Biography of Stan Freeman". Encyclopedia of Space Age Pop Music. 2008. Retrieved 2008-06-19.