Forester was an all-city, all-state, and all-Southern fullback/linebacker at Dallas Woodrow Wilson. He also played in the 1949 Texas High School Coaches Association All Star Game. He lettered at SMU from 1949-1952 and was named All-SWC linebacker in 1951 and 1952. Forester was selected to play in the 1953 East/West Shrine Game and the College All-Star Game in Chicago. He was a linebacker for the Green Bay Packers from 1953-1963 and was a member of World Championship teams in 1961 & 1962. Forester made All-Pro five times (1959-1963) and played in four Pro Bowls (1959-1962). He was a defensive captain for seven seasons and was inducted into the Green Bay Packer Hall of Fame in 1973. He is also a member of the Woodrow Wilson Athletic Hall of Fame.