Dr APJ Abdul Kalam also worked as a scientist and science administrator for the Defense Research and Development Organization (DRDO) and the Indian Space Research Organization (ISRO).
Dr. APJ Abdul Kalam served as the 11th president of India. Widely referred to as the “People’s President”, because of his simplicity.

Being a hardworking and intelligent student, he had a strong desire to learn and spent hours in studies, especially Mathematics. He grew up studying Physics and Aerospace Engineering.