In 1934 he became the last decathlon world record holder under the 1915 method of scoring, with 8790.46 points, and won the gold medal at the 1934 European Championships. In the Nazi period in Germany, Sievert was seen as a symbolic hope of the German "master race" in the 1936 Summer Olympics. However, he was injured during the games and the gold medal was won by American Glenn Morris, who also beat Sievert's record. Sievert was recommended to leave the sport after his injury.
In World War II, Sievert became an officer of the German armed forces. In Hungary in 1944, he lost his left foot to a land mine. After the war, Sievert became the chairman of Hamburg's track-and-field event federation and a sport advisor to the German government. He became ill in 1957 and quit his work, moving into the home of his father in Eutin. He married Ruth Hagemann, a fellow athlete that Sievert met while training in the 1930s, and had two daughters who also became athletes.
- Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill. "Hans-Heinrich Sievert Olympic Results". Olympics at Sports-Reference.com. Sports Reference LLC. Retrieved 5 January 2018.
- "Hans-Heinrich Sievert" (in Estonian). Decathlon. April 2, 2008. Archived from the original on June 28, 2007. Retrieved November 22, 2008.
- Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill. "Hans-Heinrich Sievert". Olympics at Sports-Reference.com. Sports Reference LLC.
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