Inquilab: Bhagat Singh on Religion & Revolution About the Author S Irfan Habib is an Indian historian of science, a widely published author, and a public intellectual. He was the Abul Kalam Azad Chair at the National Institute of Educational Planning and Administration (NIEPA), New Delhi. Before joining NIEPA, he was a scientist at the National Institute of Science, Technology and Development Studies (NISTADS), New Delhi.