Biswa Ranjan Nag

Biswa Ranjan Nag (1 October 1932 – 6 April 2004) was an Indian physicist and the Sisir Kumar Mitra chair professor at Rajabazar Science College, University of Calcutta.

[1][note 1] Born on 1 October 1932 to Sailabala and Satyaranjan Nag at Comilla, a city along the Dhaka-Chittagong Highway in the undivided Bengal of the British India (presently in Bangladesh), B. R. Nag did his graduate studies at Presidency College, Calcutta, during 1949–51 and earned a master's degree in technology (M.Tech.)

from the Institute of Radiophysics and Electronics (IRE) at the Rajabazar Science College campus of the University of Calcutta in 1954.

[2] He started his career in 1956 as a faculty member at IRE and simultaneously pursued doctoral studies, mentored by Arun K. Choudhury.

[4] He served out his regular academic career at the university and continued his association past his superannuation in 1997 as its Sisir Kumar Mitra professor.

[2] He demonstrated the temperature independence of two-dimensional electron gas and its alloy scattering limited mobility which was a first time discovery.

Liquid phase Epitaxy Semiconducting III–V compounds, acousto-electric effect and free carrier absorption, Gini ratio and Si coefficient related to hot-electron galvanomagnetic transport were some of the other areas of his research.