He completed his PhD in 1942 in the same department. His PhD thesis was on the Bulgarian question in the late Ottoman Empire, specifically during tanzimat, and constituted one of the first socioeconomic approaches in Turkish historiography. In December 1943, he became assistant professor and his research interest became focused on the social and economic aspects of the Ottoman Empire.
He received his PhD in 1942 from the same academic unit. His thesis explored the Bulgarian question within the late Ottoman Empire's tanzimat era, marking a pioneering socioeconomic approach in Turkish historical scholarship. By December 1943, he assumed the role of assistant professor and began concentrating on the social and economic dimensions of the Ottoman Empire.