Forester graduated from Woodrow Wilson High School (Dallas, Texas) in 1949. Forester was an All City, All State, and All Southern fullback/linebacker for the Wildcats. 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, and was later drafted by the Green Bay Packers. 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 captiain for seven seasons and was inducted into the Green Bay Packer Hall of Fame in 1973. Forester was inducted into the Woodrow Wilson HS Hall of Fame in 1999, and later into the Texas High School Football Hall of Fame in 2002.