Shri Devender Singh is Additional Secretary in the Lok Sabha, the House of the People. He started his service career as Legislative Officer in 1985. Over three decades, he has serviced various prestigious Committees of Parliament and the House in various capacities and earned adulation from eminent parliamentarians. With his dedicated services, long experience and the remarkable power to observe and analyse, he has made in depth study of the mechanics of parliamentary scrutiny, oversight and control.

He was principal draftsman of Public Accounts Committee on subjects like 2G spectrum, Adarsh Housing Scam, Acquisition of Aircraft by Ministry of Civil Aviation, Defence Estate Management, Operation Vijay and many others. He is author of the book, "Parliamentary Questions : Glorious beginning to an uncertain future" . A review on the book written by HK Dua, appeared in The Parliamentarian published from London. His another book, "Parliament of India: Hopes and Prospects" is under publication. A prolific writer, his articles have been published in national dailies, magazines and journals. Shri Singh is a scholar of Constitutional and Parliamentary Studies. He is faculty member of the Bureau of Parliamentary Studies and Training, Institute of Constitutional and Parliamentary Studies, PRS Legislative Research and the Indian Corporate Law Services Academy. He has delivered numerous lectures on almost all aspects of the functioning of Indian Parliament and Constitution to the probationers of All India Services, senior executives of PSUs, University Teachers, Journalists and Members of Parliament from many countries. As Secretary to Parliamentary Delegations, he has visited many countries and studied their Parliamentary Systems.