Energy modeling researcher and consultant since 1993, has a Ph.D. in production and quantitative methods (operations research) from the Indian Institute of Management, Ahmedabad. He did his graduate studies at the Indian Institute of Technology, Kanpur, with specialization in mechanical engineering. His involvement in this field has been at diverse levels: methodological developments, setting-up of large models, using models for policy analysis and the design and development of sophisticated user interfaces. He has published more than 50 articles and monographs in refereed scientific journals in the area of energy-environment modeling and analysis. He has been the key technical resource in several projects involving setting up large multi-region TIMES and MARKAL models.