Horsley began his acting career touring in stage productions of West Side Story, Damn Yankees, and Oklahoma!.
In 1981, he portrayed TV detective Archie Goodwin in the short-lived NBC drama series Nero Wolfe.
He also starred opposite Lynda Carter in a series set in the French and Indian War era, Hawkeye.
In 2006, Horsley and Marshall R. Teague traveled the world in search of exotic game on the Outdoor Life Network for the reality show, Benelli's Dream Hunts.
In 1987-1988 Season, Horsley acted in the Jerry Herman musical, Mack and Mabel, at the Paper Mill Playhouse in Millburn, New Jersey with Janet Metz, Scott Ellis, Ed Evanko, and Ruth Williamson in the cast.