His father, Sibeswar Mukherjee, was an executive with Mitsubishi, and his mother Chandana Mukherjee, was a former school teacher from Calcutta (now Kolkata). He attended St. Columba's School in Delhi, where he won the school's highest award, the 'Sword of Honour', in 1989. As a biology major at Stanford University, he worked in Nobel Laureate Paul Berg's laboratory, defining cellular genes that change the behaviours of cancer cells.