Avul Pakir Jainulabdeen Abdul Kalam (born 15 October 1931) usually referred to as Dr. A. P. J. Abdul Kalam, is an Indian scientist and administrator who served as the 11th President of India. Kalam was born and raised in Rameswaram, Tamil Nadu, studied physics at the St. Joseph's College, Tiruchirappalli, and aerospace engineering at the Madras Institute of Technology (MIT), Chennai.
Before his term as President, he worked as an aerospace engineer with Defence Research and Development Organisation (DRDO) and Indian Space Research Organisation (ISRO). Kalam is popularly known as the Missile Man of India for his work on the development of ballistic missile and launch vehicle technology. He played a pivotal organizational, technical and political role in India's Pokhran-II nuclear tests in 1998, the first since the original nuclear test by India in 1974. Some scientific experts have however called Kalam a man with no authority over nuclear physics but who just carried on the works of Homi J. Bhabha and Vikram Sarabhai.