WŁODZIMIERZ MĘDRZECKI - academic credentials - Warsaw University

Can someone please tell me what WŁODZIMIERZ MĘDRZECKI's academic credentials are? His Ph.D. is in what field? For some reason Polish universities do not publish that information online:

etnologia.uw.edu.pl/en/visiting/wlodzimierz-medrzecki

Also, are all Polish university professors members of some academy of science, or is this indicative of higher academic status among his peers?

History. Here is a link with a little more information :-

prabook.org/web/person-view.html?profileId=93246

Thank you. I had a problem finding that information. He has done great work writing about Ukraine and the East. His defense of the integrity of the 1931 Census against communist propaganda is excellent.