Achievements Competing in three Summer Olympics, she won three medals with two silvers (K-2 500 m: 1968, 1976) and one bronze (1972: K-1 500 m). Pfeffer also won four medals at the International Coach Federation Canoe Sprint World Championships with a gold (K-2 500 m: 1971), a silver (K-4 500 m: 1973), and two bronzes (K-2 500 m: 1966, 1973).