Retd Director-Professor and Head of Dept of Pathology, Calcutta National Medical College, Calcutta University, India.

Formerly,

Fellow, Rockefellar Foundation/ICMR, New Delhi.

Member, Union Public Service Commission, New Delhi.

Member, National Board of Examinations, New Delhi.

Member, Medical Council of India, New Delhi

                                 
He was the inspiration behind the creation of the website Histopathology-India.net, more than two decades ago.

Many photographs in this website and in the new youtube channel are from Prof H Roy's personal slide collection.