Oldfield was born in Elgin, Illinois, and began his career at Middle Tennessee State University where he won the Ohio Valley Conference championship three times.
After setting this mark, he had earned a cover spot on Sports Illustrated, and also made an appearance in a 1975 issue of Playgirl.
Unusual for track athletes at the time, he wore his hair long in a style he dubbed the "Oldfield Mop" and occasionally sported a beard.
At the 1972 United States Olympic Trials, an opponent was quoted as saying, "I will retire the day that I lose to someone like Brian Oldfield."
Oldfield competed in the World's Strongest Man contest in 1978, finishing seventh in a field of ten competitors.
In the film, Oldfield wears a special spiked headgear that his character uses to head-butt people to death.
[11] Near the end of his life, injuries from his time in competition reduced the athlete to walking with a cane and using a wheelchair.