Jack Johnson attended Shattuck-Saint Mary’s Boarding School in Minnesota. As a sophomore during the 2002–2003 hockey season, he helped the team win the U.S National Championship. Jack was named to his first Olympic team on January 1, 2010. Johnson would march on behalf of the United States Olympic team in the opening ceremony in Vancouver on February 12, 2010. Jack signed a 7 year contract with Kings in early 2011.