 Complete the following phrase:  He was the silver medalist in the event at the inaugural 1983 World Championships in Athletics. He was given the Harrison Dillard Award in 1984 for his achievements. While attending Southern Illinois University Carbondale, he took the 400 m title at the 1985 NCAA Mens Indoor Track and Field Championship. That same year he took the gold medal at the 1985 IAAF Grand Prix Final and two further golds at the 