Wlodzimierz 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 at the Medical Academy in Kraków, later transformed into the Jagiellonian University Medical College.
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 papers, and was one of the most frequently cited Polish scientists in the field of biomedicine after 1965.
A graduate of the Medical Academy in Kraków, he was forcibly drafted into the Polish Army between 1952–1957.
He obtained Ph.D.
in 1962 at the Medical Academy in Szczecin.
In 1967, he received British Council scholarship to the National Institute for Medical Research in London.
From 1974 until 1999, he was a visiting professor at Yale University, meanwhile standing as the Vice-Rector of the Medical Academy in Kraków (1978–1981) and a member of the Presidium of the International Union of Immunological Societies (1983–1986).
He was also a member of the Presidium (1978–1984) and a Chairman (1988–1990) of the Scientific Council by the Minister of Health and Welfare of Poland.
Later, he was appointed a Secretary (1989–1995) and Vice-President (until 2008) of the Medical Faculty of the Polish Academy of Learning.
He received several awards and state distinctions, including the Knight's Cross (1977) and the Commander's Cross (1997) of the Polonia Restituta.