Sanjay Kumar is Professor and Director at the Centre for the Study of Developing Societies (CSDS), Delhi, India. He is one of the founding members and currently the Co-Director of Lokniti, a research programme of CSDS. His area of specialisation is electoral politics, though by using the survey method he has been engaged in research on a wide range of themes: Indian youth, the state of democracy in South Asia, Indian farmers, slums of Delhi and electoral violence. He has published several books, edited volumes, contributed chapters and published articles in various journals. His most recent book is Post-Mandal Politics in Bihar: Changing Electoral Patterns (2018). His other publications include the books Electoral Politics in India: The Resurgence of the Bharatiya Janata Party (with Suhas Palshikar and Sanjay Lodha, 2017); Changing Electoral Politics in Delhi: From Caste to Class (2013); Measuring Voting Behaviour in India (with Praveen Rai, 2013); Indian Youth in a Transforming World: Attitudes and Perceptions (with Peter R. deSouza and Sandeep Shastri, 2009); Indian Youth and Electoral Politics: An Emerging Engagement (2014) and Rise of Plebeians? The Changing Face of Indian Legislative Assemblies (with Christophe Jaffrelot, 2009). He also writes regularly for national and regional newspapers, both in English and Hindi languages. His articles are published in The Hindu, The Indian Express, The Asian Age, Deccan Chronicles, Dainik Bhaskar, Rajasthan Patrika and Mint. He appears frequently on Indian television as a psephologist and political commentator, and has been an international election observer in many countries.