Career
He played college football for Hardin–Simmons University. He twice led the National Collegiate Athletic Association major colleges in rushing yardage with 1,281 rushing yards in 1942 and 1,262 yards in 1946. His total of 1,281 rushing yards in 1942 set a modern collegiate rushing record.
His football career was interrupted by military service during World World War World War II Mobley served from May 1943 to February 1946.
With Mobley as the leading ground-gainer and Warren B. Woodson as head coach, Hardin-Simmons compiled a perfect 11-0 record in 1946.
Mobley was drafted by the Philadelphia Eagles of the National Football League (NFL) in the 11th round of the 1945 NFL draft, and played one season for the Baltimore Colts in 1947.