Dr. Sankar Ranjan Roy Choudhury, eminent professor and educationist, was born in the then zamindar family of Ulpur in East Bengal, now Bangladesh in 1939 and displaced in 1947 after partition of the country. He crossed over the border to Calcutta with parents and siblings and took shelter in a slum at Kidderpore where he experienced the hardest days of life struggling with acute poverty for long ten years until he completed his school education. Immediately after passing School Final Examination he got an employment at the age of 19 under Calcutta Port Commissioners as a junior clerk and thus started his second phase of struggling life changing  employment to A.G. Bengal, South Eastern Railway, St. Peter's High School one after another and continuing studies side by side. Thus he completed M.Com. Finally he was conferred upon PhD. degree by the Calcutta University for his Doctoral thesis entitled "Government Control of Economic Enterprise in West Bengal".

An alumnus of Barisha Vivekanada College Dr. Roy Choudhury served his own college for 30 years as Reader in the department of commerce and retired in 1999. He served the Calcutta University as examiner, question setter, moderator and discharged some other responsibilities he was entrusted with. Also he was attached to Burdwan University.

Other than academic activities he devoted himself to social services under the banner National Services Scheme (NSS) funded by the University Grants Commission (UGC) and organized summer camps with groups of students in different villages in South 24-Parganas with health awareness, adult education, link road construction and many other social programmes.

He started travelling abroad in 1989. After retirement he has become world trotter and visited till now about 115 countries around the globe covering Greenland touching North Pole living with Eskimo family, hunting polar bear, eating raw fish and simply boiled meat, South Atlantic Ocean touching Antarctic Circle, top of the Alps and the remote islands of Pacific Ocean and has been countinuing his journey with a time framed programme with an eye to complete the whole world consisting of 196 countries.

He has penned fifteen books including text books on commerce subjects, novels, biography, scenario for film and travel accounts and contributes articles in journals like Bhraman, Bartaman, The Statesman and many others.
Dr. Sankar Ranjan Roy Choudhury is an ardent atheist and unhesitatingly kicked the idol of Saraswati, the so called goddess of learning, out of his house in his early age.