Sjaak Köhler
Jakob Frederik "Sjaak" Köhler was a Dutch water polo player and swimmer. He finished in seventh and fifth place with the Dutch water polo team at the 1924 and 1928 Olympics; at both Games he played three matches and scored four and two goals, respectively. In 1924 he also competed in two freestyle swimming events, but failed to reach the finals. His cousin Koos played water polo alongside Sjaak at the 1928 Olympics.
