Worked as a laboratory assistant at the Forest Research Institute Dehradun while secretly running a revolutionary network; planned and helped execute the 1912 Chandni Chowk bombing of Viceroy Hardinge; organised the failed 1915 pan-India army uprising with Sachindra Nath Sanyal; escaped to Japan disguised as a Tagore relative; became a Japanese citizen; corresponded with Savarkar from the late 1930s and founded a Japan branch of the Hindu Mahasabha at Savarkar's suggestion; convened the conferences that founded the Indian Independence League and the Indian National Army; formally handed over leadership of the IIL and INA to Subhas Chandra Bose at Singapore's Cathay Theatre on 4 July 1943, describing it as passing on the baton of the revolutionary movement.
Contribution
Single most important bridge node in the entire network: links Bengal/Anushilan to Ghadar to the Japan-based Indian Independence League to Subhas Bose and the INA.
After the movement
Died of cerebral haemorrhage in Tokyo, weeks before his son was killed at Okinawa and before seeing India's Independence.