Question: Were Carl Jacob Burckhardt and Józef Pszenny of the same nationality?
Sentence (from "Carl Jacob Burckhardt"): His career alternated between periods of academic historical research and diplomatic postings; the most prominent of the latter were League of Nations High Commissioner for the Free City of Danzig (1937–39) and President of the International Committee of the Red Cross (1945–48).
Relevant evidence: No