Jack George Sieg (December 10, 1914 – December 21, 1968) was an American swimmer who used the butterfly stroke in 1935,[1] developed by his coach Dave Armbruster.[2] He competed for the University of Iowa[3] and first used the stroke in a breaststroke leg of a medley relay February 25, 1935.[4]

Jack Sieg
Personal information
Born(1914-12-10)December 10, 1914
Kansas City, Missouri, United States
DiedDecember 21, 1968(1968-12-21) (aged 54)
Oklahoma, United States
Sport
SportSwimming
ClubUniversity of Iowa

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