What is the birthdate of this American professional basketball player who played for the Atlanta Hawks and who is the son of a retired American professional basketball player, head coach, and former General Manager of the National Basketball Association's Los Angeles Clippers?
Mike Dunleavy Sr.: Michael Joseph Dunleavy Sr. (born March 21, 1954) is an American retired professional basketball player, head coach, and former general manager of the National Basketball Association's Los Angeles Clippers. Mike Dunleavy Sr.:  He is currently the head coach of the Tulane University men's basketball team. Mike Dunleavy Jr.: Michael Joseph Dunleavy Jr. (born September 15, 1980) is an American professional basketball player who last played for the Atlanta Hawks of the National Basketball Association (NBA).
September 15, 1980