- (Late 1960s) TV Commercial: Phillips 66.
- (1985) Print ads for Dewar's White Label Scotch Whisky in a "Dewar's Profile".
- (1980) TV commercial for Cheker Gas
- (1965 - 1971) Professional football player with the Chicago Bears of the National Football League.
- (2009 - 2013) University of Kansas Athletic Department's Director of Fundraising for Special Projects.
- (1984 - 2009) Founded and operated Crest Computer Supply Company (later Sayers 40, Inc.) serving as Chairman and CEO of the technology consulting and implementation firm, with national offices located in Vernon Hills, Illinois; Walpole, Massachusetts; Clearwater, Florida; and Atlanta, Georgia, USA. Gale Sayers continued to serve as non-executive Chairman of the Board of the company until shortly before his death in 2020. The company continues in business as Sayers, Inc., with offices in: Atlanta, Georgia; Bloomington, Indiana; Boston, Massachusetts; Chicago, Illinois; Dallas, Texas; and Moline, Illinois, USA.
- (1985 - 1986) Interim Athletic Director of Tennessee State University at Nashville, Tennessee, USA.
- (1976 - 1981) Athletic Director of Southern Illinois University at Carbondale, Illinois, USA.
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