 Complete the following phrase:  He competed for Switzerland at the Summer Olympics in 1992 and 1996  at the latter edition he became the oldest ever sprinter to compete in the mens 100 metres at the Olympics. He represented his country at the European Athletics Championships on three occasions 1982, 1990 and 1994 and also ran at the 1995 World Championships in Athletics. He had his best international performances indoors, reaching the semi-finals at the 