He was co-editor (with his mentor Kraelitz) and contributor to the first scholarly journal in this field, called Mitteilungen zur osmanischen Geschichte (Notes on Ottoman History), of which two volumes appeared between 1921 and 1926.

[5] He also examined beylik-period architecture and collaborated with Friedrich Sarre and Karl Wulzinger [de] on a monograph of late medieval Miletus under Islamic rule.

[6] He claimed a part in the collective effort of Turkish historians to put a halt to the sale of Ottoman treasury archives to Bulgaria as scrap paper by İsmet İnönü's government in 1931.

[7] After Hitler's rise to power in Germany, Wittek resigned from his Istanbul post in the summer of 1933 due to his opposition to the Nazi Party[8] and moved with his family to Belgium in 1934, where he worked at the Institute for Byzantine Studies in Brussels with Henri Grégoire.

Wittek, who was a devoted member of the George Circle (along with the fellow medievalist and academic refugee Ernst Kantorowicz[9]), published relatively little and mostly in short form, but became very influential within his discipline.