He was educated in Belgium, University of Liege. Upon his return to Poland (Privislinsky Krai, Russian Empire), he became one of technical directors in the Lilpop, Rau i Loewenstein factory in Warsaw, and then the company's representative for all of Russian Empire. He also served as a general secretary of three Russian technological syndicates and simultaneously started his own company in Sankt Petersburg.
In 1881–82, together with Nikolay Benardos, a Russian engineer, he developed method of carbon arc welding patented in France in 1885 and in the US in 1887 . He was also a known benefactor and sponsor of, among others, the Polish Gymnasium of Cieszyn. He died 15 July 1898 in Giessen. His body was then transported to Poland and buried at the Powązki Cemetery.
- "80 lat Przeglądu Spawalnictwa", the newspaper "Przegląd Spawalnictwa" nr 10, Warszawa, 2008, ISSN 0033-2364, p 3-9.
- Nikołaj Benardos, Stanisław Olszewski, "Process of and apparatus for working metals by the direct application of the electric current" patent nr 363 320, Washington, United States Patent Office, 17 may 1887.
- (Polish) Stanisław Olszewski
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