Włodzimierz Wojciech Ptak (2 November 1928 – 28 May 2019) was a Polish immunologist and microbiologist, professor of medical sciences, member of the Polish Academy of Sciences and the Polish Academy of Learning, professor and Vice-Rector at the Medical Academy in Kraków, later transformed into the Jagiellonian University Medical College, visiting professor at Yale University. In his scientific work, he studied mainly the regulatory mechanisms of the immune response. Together with Richard K. Gershon, he co-authored the discovery of regulatory T cells. He published more than two hundred research
