Partha was born on December 6, 1963 in Calcutta, India. Son of Prakash Chandra and Uma. He was born into a family that made serious contributions to the realm of intellectual activities and social reforms. He is married to Renu Mahajan who is a senior bureaucrat of NSW Government in Australia. His son, Karno, did a joint degree in Commerce & Psychology from UNSW and works as a re-insurance specialist at Munich Re. His daughter, Ishani, is a budding author and goes to Sydney Girls High School. His dog, Zoe, is a mini fox terrier.