When was the American actor and producer born who was lead actor in the television series "MacGyver" (1985–1992) and also present in Season four of "Stargate SG-1"?
Stargate SG-1 (season 4): Season four of "Stargate SG-1", an American-Canadian television series, began airing on June 30, 2000 on Showtime. Stargate SG-1 (season 4):  Season four regular cast members include Richard Dean Anderson, Michael Shanks, Amanda Tapping, Christopher Judge, and Don S. Davis. Richard Dean Anderson: Richard Dean Anderson (born January 23, 1950) is an American actor and producer.
January 23, 1950