His research interests focus on the modern and contemporary Muslim world, in particular intellectual and political developments in both regional and global contexts, as well as on theory and method in the study of Islam as a field of scholarly inquiry.
Upon completion of a dissertation on the theory and practice of the Islamic law of treaties, in 1987, he was awarded the academic title of doctorandus (equivalent to an MA) in Arabic Language and Culture with cum laude distinction.
It has since been published as Cosmopolitans and Heretics by Hurst and Oxford University Press Except for a sabbatical year (1995–96), from 1988 until 2003, Carool Kersten worked for the Dutch construction and engineering company Ballast Nedam Group.
In recognition and appreciation of his services to the university and to his academic field, effective 2 July 2022, King's College London conferred on him the title of "Emeritus Reader in the Study of Islam and the Muslim world".
Carool Kersten is founding editor of the book series Contemporary Thought in the Islamic World, published by Routledge since 2011, and a Fellow of the Higher Education Academy (HEA).