He turned pro in 1970 and joined the PGA Tour in 1972.

His first win on the Champions Tour – at the Mexico Senior Classic in 2001 – came just before his 56th birthday.

He won the Emerald Coast Classic about a month later, and the Georgia-Pacific Grand Champions Championship in 2005.

McCullough was inducted into the Toledo Golf Hall of Fame in 1999, and is also a member of the Bowling Green Athletic Hall of Fame.

; Mark, and Michelle, graduates of Trinity University both with degrees in History.