[1][2][3] He was an educationalist, prominent Christian leader of Bengal, and was the chairman of the Minority rights committee and Provincial constitution committee of the Constituent Assembly—consisting of indirectly elected representatives to draft the Constitution of India, including for provinces of present Pakistan and Bangladesh (then East Bengal) – the assembly considered only Muslims and Sikhs as religious minorities – after India became republic, the same Constituent Assembly became the first Parliament of India in 1947.

[2][3][4][5][6][7][8] Born in Bengali Christian family in Bengal, he did MA, PhD, D.Litt, and was the first Indian to receive a Doctor of Philosophy degree (from the University of Calcutta).

[2][3][4][5][7][12][13][14] Following the dissolution of the Constituent Assembly, Dr. Mookerjee was appointed Governor of West Bengal from 1 November 1951 through 7 August 1956.

While working as Bengal governor, he served as the president of "Desh Bandhu Memorial Society" from 1953.

[18][19] He confessed to his community as:We have to demonstrate by every word we utter and by every act we perform that the professing of a different religious faith has not tended in the least to make us less Indian in our outlook than our non-Christian brethren, that we are prepared to play our part and to shoulder our share of the responsibility in every kind of work undertaken for the benefit of our country as a whole.

[19][8] He was the only candidate to be unanimously nominated for Vice-Presidency, with a resolution moved by Pattabhi Sitaramayya, a member of Indian National Congress and Constituent Assembly of India; consequently, he expressed his gratitude in the Constituent Assembly of India that met in the Constitution Hall, New Delhi as:Mr. President, Ladies and Gentlemen.

Some people had egged me to seek election, but at the last moment deserted me and I was determined to show that though I have been a school-master all, through my life, It was possible for a schoolmaster to be a better man than the black-mailing voter.