A 14-time Polish champion, Kazimierz Neumann competed internationally in the coxless fours. In 1958, his boat reached the final of the European Championships in front of a home crowd at Poznań, but placed last in that race. The following year, Neumann’s crew missed the final, winning the B-final instead. The same crew also entered the Olympics in 1960, but was eliminated in the repechage round. Neumann’s two sons, Krzysztof and Wojciech both became rowers like their father, but were far less successful.