S. Hasan Mahmud is a historian specializing in pre-modern Indian administrative and economic history. His research often involves the study and translation of historical documents from various periods. In 'An Eighteenth Century Agrarian Manual (Yasin’s Dastur-i Malguzari),' published by Kitab Bhavan, Mahmud presents and analyzes an important agrarian manual from the 18th century, offering insights into land revenue administration and agricultural practices of the period.