He was the son of Rai Bahadur Tarak Chandra Das, a judge, and Mohini Devi, who was later a staunch Gandhian and Independence activist.

Mohini Devi was also a former President of the Mahila Atma Raksha Samiti, an organisation committed to women's self defence.

Amongst his siblings, the most notable was Dr. Prabhavati Das Gupta, a graduate from Heidelberg University and a trade union activist along with her husband and Congress MP Bakar Ali Mirza.

Das sailed for the United States on a scholarship from the Indian Society for the Advancement of Scientific Industry, and enrolled at UC Berkeley.

With growing demand, the company expanded by creating distribution offices in all major cities in the country, and set up additional manufacturing plants in present day Tamil Nadu.

Das was a much beloved figure in Calcutta, and was a lifelong believer in the Swadeshi philosophy and continued to be staunchly anti-British even post-Independence.

He was immensely popular in the Baidya community as well, providing scholarships to a number of young boys who came to Calcutta for their education.

At the time of his funeral, a number of people came forward and recounted how, on his walks around the lakes in Calcutta, Das would stop them and encourage them to give up the idea of looking for a job and start something of their own - no matter how small.