McCormack is a 1987 graduate of Ithaca College where he played both football and lacrosse and majored in physical education.  He played outside linebacker in football team and defensive midfielder for the Bombers' lacrosse squad.  During his senior year the football team played for the national championship in the Amos Alonzo Stagg Bowl.

McCormack previously coached at Union , Norwich, Boston College and Ithaca. While at Union, McCormack coordinated the pass defense and coached the defensive secondary and special teams.  Union twice led the nation in pass efficiency defense under his tutelage.  He was also the head lacrosse coach at Union and in 1999 was named co-coach of the year in the Upstate College Athletic League.  McCormack coordinated the defense for the lacrosse program and in 1999 the man down unit led the nation in save percentage.

At Williams, McCormack also serves as an assistant professor of physical education and is the head men’s lacrosse coach. In 2007 the Ephs advanced to the NESCAC semifinals for the first time.

George and his wife Kristen live in Williamstown with their three sons Brett (12), Michael (10) and Sean (8).