Health economist and Professor of Community Medicine at PGIMER, India, with expertise in health technology assessment, cost-effectiveness analysis, and universal health coverage. Holds MBBS, MD, MSc from London School of Hygiene and Tropical Medicine, and international doctoral training from Swiss Schools of Public Health. Led India's largest health system costing study (CHSI) and published over 250 peer-reviewed articles. Advisor to WHO, World Bank, and Government of India on health financing and policy.