Mookerjee was born on 1 January 1929 in
Kolkata,
British India. His father Rama Prasad Mukherjee was a judge of the
Calcutta High Court. He passed Matriculation Examination in the First Division from Mitra Institution, Bhowanipore, got First Class in the Preliminary, Intermediate and Final Law Examinations of the
Calcutta University and passed M.A. in Economics in 1951. Mookerjee entered the legal profession in November 1953. ==Career==