Howell was born in Fresno, California. He was a Parade magazine high school All-American for Fresno High School football team in 1974, and Central California Valley discus throw champion in track and field.
College career
Howell attended the University of Southern California, where he played for the USC Trojans football team. As a senior in 1978, he received unanimous All-American honors.
Professional career
The Houston Oilers chose Howell in the second round (forty-ninth pick overall) of the 1979 NFL Draft, and he played for the Oilers from 1979 to 1983, and Atlanta Falcons between 1983 and 1985.
Football family
His son, Nick Howell, was an offensive lineman for the USC Trojans, after playing football at Bullard High School in Fresno, California.