A 6'3" guard, Freeman attended Madison High School and the University of Illinois. At Illinois, he scored 1449 points and averaged 20.1 points and 10.3 rebounds per game over his three varsity seasons. After finishing his college career as the most prolific scorer in Illinois history, he now ranks 12th all-time in Illinois scoring, and set a record for most points in a season (668), averaging 27.8 in 1965–66. He received first team All Big Ten and first team All-American honors that same season. In 2004, he was named to the University of Illinois' All Century Team.
After his career ended, he returned to Champaign, Illinois, where he launched a career in banking. His son, also named Don, was born in 1967, and later attended Rice University on a tennis scholarship. In 1981, he moved to Texas and later to Omaha, Nebraska, where he still resides.
2008 – Honored as one of the 33 honored jerseys which hang in the State Farm Center to show regard for being the most decorated basketball players in the University of Illinois' history.
2019 – Inducted into the Illinois Athletics Hall of Fame[4]
† Special voting by the panelists selected Julius Erving as the ABA's all-time most valuable player and Bobby Leonard as the ABA's all-time best head coach