David Longley was a multi-sport athlete at Baylor who went on to play two sports in college. At Baylor, he was All-City and All-Mid-South in football, basketball, and baseball. He received the Ted Nelson Best Athlete Award his senior year. He also served as vice chairman of the Honor Council and treasurer of the senior class, received the Jumonville Award, and graduated cum laude.
At Vanderbilt University, he played football from 1959-62 and baseball from 1960-63. In 1963, he set Vanderbilt season records for most home runs, most RBIs, most total bases, and highest slugging average. He played professional football with the Chattanooga Cherokees in the Southern Professional League and was voted to the All-Army football team while playing at Fort Hood, Texas, in 1964.
From 1965-74, he taught and coached at Baylor. He was the offensive backfield coach on the great Baylor football teams of 1972 and 1973. He was also the head baseball coach and an assistant basketball coach during his tenure.