He did his MBA with distinction from Harvard Business School and MS in Energy Management and Policy, University of Pennsylvania and BTech with Distinction from IIT, Delhi. An avid tennis player, he is married to Punita Kumar-Sinha, an investment manager and former Senior Managing Director at The Blackstone Group. Jayant has been active in Hazaribagh, assisting his father's election campaigns since 1998. He has also worked on a variety of projects in Hazaribagh and Ramgarh districts such as fostering self-help groups, distributing solar lanterns, improving drinking water quality, and getting village roads built. Besides campaigning for his father, Jayant has worked with party veteran Murli Manohar Joshi and Arun Shourie on the BJP's manifesto during the 2009 Lok Sabha elections.