In 1928 he won the bronze medal in the heavyweight class after winning the third place fight against Sverre Sørsdal.
He participated in the 1927 European Amateur Boxing Championships winning the third place and again in the 1930 European Amateur Boxing Championships where Michaelsen became European champion defeating Sweden's Bertil Molander in the final.
- Taylor, Paul (2004). Jews and the Olympic Games: The Clash Between Sport and Politics : with a Complete Review of Jewish Olympic Medallists. Sussex Academic Press. ISBN 9781903900871.
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