As you have asked about the director General and other members of Defence Research and Development Organization (DRDO), I am giving you information about it, check below for the details

Dr S Christopher, Secretary Department of Defence R&D
Dr G Satheesh Reddy, Scientific Advisor to Raksha Mantri

Directors General

Dr. K Tamilmani, Director General - Aeronautical Systems (Aero)
Dr. Keshav Dattatreya Nayak, Director General - Micro Electronic Devices & Computational Systems (MED & CoS)
Dr. Manas K Mandal, Director General - Life Sciences (LS)
Dr. Satish Kumar, Director General - Missiles and Strategic Systems (MSS)
Ms J Manjula, Director General - Electronics & Communication Systems (ECS)
Shri Pravin K Mehta, Director General - Armament & Combat Engineering Systems (ACE)
Dr. Subhash Chandra Sati, Director General - Naval Systems and Materials (NS & M)

Contact:

DRDO bhawan
Government Office
Address:
Rajaji Marg, Vijay Chowk Area, Central Secretariat,
New Delhi, Delhi 110004
Phone:011 2300 7002