Career
Prior to that he was the during the reign of Maharaja Hari Singh and played a key role in the accession of J&K to India. He was the Indian National Congress nominee on the Radcliff Commission that defined the boundaries of India and Pakistan. As a judge he was incisive and forthright and had many leading judgments to his cartulary-register
Mahajan started his career as a lawyer in 1913 in Dharmshala, where he spent a year practising.
He spent the next four years (1914-1918) as a lawyer in Gurdaspur. He then practiced law in Lahore from 1918 to 1943.
During his time there, he served as president of the High Court Bar Association of Lahore (1938 to 1943). Mahajan was Prime Minister of J&K during 1947 and played a role in the accession of the state to India.
He was the one who turned down the offer of district Lahore and instead annexed district Gurdaspur to India.
Mahajan took office as the third Chief Justice of India on January 4, 1954. He was the head of India"s judicial system for almost a year, until his retirement on December 22, 1954 (mandatory retirement at age 65). Before becoming Chief Justice he served as one of the first Judges of the Supreme Court of independent India from October 4, 1948 to January 3, 1954.
Director, Punjab National Bank, 1933-1943
President
Doctorate.A.V. College, Managing Committee, 1938-1943
Fellow and Syndic, Punjab University, 1940-1947
Judge, Lahore High Court, 1943
All India Fruit Products Association Bombay Session, 1945
Member, R.I.N. Mutiny Commission, 1946
1947 Prime Minister, Jammu and Kashmir State 1947-1948
Judge, East Punjab High Court
Punjab Boundary Commission, 1947
Syndic, East Punjab University, 1947-1950
Constitutional Adviser to His Highness the Maharaja of Bikaner, 1948
Honorary Degree of Doctor of Laws, Punjab University.
1948
Member, Fruit Development Board, Punjab
Commission on Belgaum (dispute between Karnataka and Maharashtra), 1967.