Stepan Prokopovich Timoshenko (Ukrainian: Степан Прокопович Тимошенко, romanized: Stepan Prokopovych Tymoshenko; Russian: Степан Прокофьевич Тимошенко; December 22 [O.S. December 10] 1878 – May 29, 1972), later known as Stephen Timoshenko, was an ethnic Ukrainian, citizen of the Russian empire and later, an American engineer and academician.
He is considered to be the father of modern engineering mechanics. An inventor and one of the pioneering mechanical engineers at the St. Petersburg Polytechnic University. A founding member of the Ukrainian Academy of Sciences, Timoshenko wrote seminal works in the areas of engineering mechanics, elasticity and strength of materials, many of which are still widely used today. Having started his scientific career in the Russian Empire, Timoshenko emigrated to the Kingdom of Serbs, Croats and Slovenes during the Russian Civil War and then to the United States.[10][11][12][13][14][15]
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