After that he had done master's degree in Statistics (M. Stat) from ISI, 1969 and in also did Post Graduate Diploma in Demography from ISI and Summer Course on Population from East-West Centre, Hawaii, United States and Korean Institute of family planning, Seoul, South Korea, in 1974 with special Workshop on Demographic Survey Research Methods.

[1] Recently in 2010, he completed the Post Graduate Diploma in ‘Appreciation of Indian Art’, from the Ramakrishna Mission Institute of Culture, Kolkata.

[2] Biswatosh was the Additional Director-in-Charge in Socio-Economic Planning and Appraisal Maintaining Evaluation in Kolkata Metropolitan Development Authority (KMDA), Salt Lake.

He was also an ex-member of working group on Perspective Plan for Calcutta Metropolitan Area(CMA), State Planning Board, Government of West Bengal and initially he was associated with the Calcutta Fertility Survey of ISI, 1970–72 and later associated with the Socio-Economic Survey of KMDA (formerly CMDA), 1996.

His 4th solo exhibition on Creative Photography will be held on 11 December 2013 for three days at the Gaganendra Silpa Pradarshasala, Kolkata .