Dr. APJ Abdul Kalam was an Indian scientist and politician who served as the 11th President of India. He spent over 4 decades working for Defense Research and Development Organization (DRDO) and Indian Space Research Organization (ISRO), playing a key role in developing ballistic missile and nuclear weapons technology in India. Known as the 'Missile Man of India', Kalam made significant contributions to science and politics before passing away in 2015 while delivering a lecture at IIM Shillong from an apparent cardiac arrest.