Offensive tackle who was a starter for the Indianapolis Colts during every game of the 2012 and 2013 seasons. He was drafted 22nd overall by the team in 2011.
He played offensive line, defensive line and tight end at Lake Zurich High School.
He was a two-time All-ACC lineman at Boston College, while also breaking the school's record for consecutive starts with 54.
He was born to parents Bill and Shari Castonzo. He has a brother named Bill Jr.
He protected future NFL quarterback Matt Ryan as a true freshman at Boston College.