A three-time winner of the 110 metres hurdles at the IAAF Grand Prix Final, he also won the 1987 Overall Grand Prix title, with fellow hurdler Greg Foster second and pole vaulter Sergey Bubka third.

Campbell was the youngest member of a movement that considered circumventing the U.S. boycott by competing under the International Olympic Committee flag, in an effort to make a statement that politics and sports should not be mixed.

However, threats by U.S. officials to revoke athletes' passports and visas caused the effort to fold.

"[1] Campbell qualified and participated in the 1984 Summer Olympics in Los Angeles, California, taking 5th in the 110m Hurdles; and again in for the 1988 Seoul Games, where he won the bronze medal.

[3] He coached former American footballer David Wilson in the triple jump prior to the 2016 US Olympic Trials.