Hassan is working on molecular phylogenetic and conservations of the herpetofauna. His main research interest lies on crypticity of little known amphibians, their micro habitat use, distribution pattern and the effect of anthropogenic activities. Previously, he worked on the taxonomy of cryptic amphibians of Bangladesh, focusing on north-eastern Bangladesh. Hassan employed molecular, morphometric and advertisement call approaches to describe amphibian species and added a few species to the national checklist of Bangladesh. Beside the herpetofauna, he is also interested in the ecology of nocturnal mammals. You can find his research on Research Gate.