Moomaw played linebacker in 1950, 1951, and 1952. During that time, he was named a two time All-American (in 1950 and consensus in 1952), making him the first in UCLA history. He was named MVP both in 1950 and 1952, and he was co-captain in 1952.
Moomaw's UCLA jersey number (#80) has been retired by the team. He was inducted into the College Football Hall of Fame in 1973, and the UCLA Athletics Hall of Fame in its inaugural year of 1984. His football legacy at UCLA continues through the "Donn D. Moomaw Award for Outstanding Defensive Player in USC Game", which is still given today.
In 1993, he was forced to resign as a result of "sexual contact" with five women. In 1997, he was allowed to return to the pulpit on a full-time basis at the 800-member Village Community Presbyterian Church in Rancho Santa Fe. Prior to that position, Rev. Moomaw was allowed to serve as the guest preacher at St. Andrew's Presbyterian Church.