Raja Ramanna was an Indian physicist who is best known for his role in India’s nuclear program during its early stages. Having joined the nuclear program in 1964, Ramanna worked under Homi Jehangir Bhabha, and later became the director of this program in 1967. Ramanna expanded and supervised scientific research on nuclear weapons and was the first directing officer of the small team of scientists that supervised and carried out the test of the nuclear device, under the codename Smiling Buddha, in 1974. Ramanna was associated with and directed India’s nuclear program for more than four decades, and also initiated industrial defence programmes for the Indian Armed Forces. Because of his directing role and leadership in developing the Indian nuclear programme over four decades, Ramanna is often considered the “Father of the India’s nuclear program”.