Born in Brooklyn, New York, he was a 6'2" (1.88 m) and 205 lb (93 kg) forward and he attended Brown University, where he earned a Bachelor of Arts degree in English.

His final season in the league, in 1953–54, was spent with the Baltimore Bullets, playing only two games in 11 total minutes, grabbing 2 rebounds and dishing out one assist.

After his NBA career Mahoney played for the semi-professional Lenox Merchants, and served as a basketball coach at Berkshire Community College and the former Stockbridge School.

[1][2] In addition, he worked as an electrician for many years,[1] and taught English at Berkshire Community College and Monument Mountain Regional High School.

[4] He was a member of the Irish American Club of Berkshire County and the NBA Players Association.