He was influenced by the professor of medieval and modern history Max Lehmann under whose supervision he wrote doctoral dissertation Die letzte Polnische Koenigswahl (1894).

Famous Poles supported Askenazy: Stefan Żeromski, Zofia Nałkowska, Karol Szymanowski, Leopold Staff, Andrzej Strug, Jarosław Iwaszkiewicz, Antoni Słonimski, Wacław Sieroszewski who signed an appeal (published in Robotnik, 2 March 1920) for a place for Askenazy at Warsaw University, however in vain.

His candidacy for this post was supported by Józef Piłsudski and nomination was signed by the Foreign Minister of Poland, Eustachy Sapieha in May 1920.

He cooperated later with other Polish Foreign Ministers: Konstanty Skirmunt, Gabriel Narutowicz and Aleksander Skrzyński.

[citation needed] Askenazy's idea of describing a nation's history through its social and economic development, as well as its international and diplomatic backdrop, remains influential in modern Polish historical studies.