Tom Biddison graduated in 1928 from Johns Hopkins University with a BA degree. He later attended the University of Maryland Law School, until 1931. He then worked as a lawyer in Maryland. He also held political positions as States attorney, director of the Maryland Department of Correction, and solicitor for the city of Baltimore. While studying at Johns Hopkins, Biddison played football and lacrosse, both extremely successfully. At lacrosse, he was a three times US champion, and was selected three times as an All-American, and also made the All-Time Hopkins Team. Posthumously, he was inducted into the United States Lacrosse Hall of Fame.