An infantry officer, Col. S.C. Tyagi (Retd) was commissioned in the Rajput Regiment of the Indian Army and held various instructional and staff appointments at the NDA and the Army War College. He took part in the operations of the IPKF in Sri Lanka and voluntarily served in the Kargil war zone during Operation Vijay. He was the Founder Commandant of the Corps Battle School in the Kashmir Valley. After retirement from active military service, he has served in the Ministry of Electronics and IT and as a Cyber Consultant with the Government of India. He has also been a Research Fellow at the USI, where he authored his first book, The Fourth Estate: A Force Multiplier for the Indian Army.