Sigurd Juslén was a chemist. Since 1908, he worked for the mineral water and soft drink company Hartwall. There, he became technical and operations manager under CEO Pekka Hartvall. In this position, he was invited to join the crew of the Finnish boat “Heatherbell” that placed third and last in both races of the 12 metres class at the Stockholm Olympic Games in 1912. With only three yachts competing, the crew still took bronze.
With his wife Gretel Dolores (née Kuhlefelt) who he married in 1925 he had two daughters. He was also known as an excellent baritone solo singer, gave concerts regularly and even produced some records.