Carrigan was a two-sport standout at Holy Cross, and later gained fame as the man who led the Boston Red Sox to two world series titles. He spent two years with the Crusader football team (1904 and 1905) and was the starting catcher for the HC baseball team from 1905-06 before signing with the Red Sox at the end of his second season. He spent his entire career with the Red Sox, batting .257 in 706 games from 1906-1916. His playing time was reduced beginning in the middle of the 1913 season when he took over as Boston's player/manager. In his first full season as player/manager, the Red Sox won 91 games. In his next two years they won 101 and 91 games respectively, and also captured the 1915 and 1916 world championship. He was the first Red Sox manager to win two world champions, and was for many years the only such man until Terry Francona accomplished the feat in 2007. After leaving baseball for a career in banking, he returned to manage the Red Sox from 1927-29, but could not duplicate his previous success. He passed away in 1969.