He was born in a renowned Bengali family on 1 October 1883 in Sankar Ghosh Lane, Calcutta.

He was called to the Bar (Gray's Inn),[1] 27 January 1908 and he enrolled in the Calcutta High Court in 1909.

He taught English and Comparative Philology at Calcutta University till his death in 1917.

He married an accomplished English woman Emily G. Atkinson in 1913.

Roby Datta with his wife Emily lived in his ancestral house on Kashinath Dutt Road, Baranagore (a suburb of Calcutta (Kolkata), INDIA.