Involved in empirical trade research for more than 15 years, he has also taught in India, Tanzania, and Germany. Earlier, he was associated with the Poverty and Development Division of UN-ESCAP, Bangkok. Dr. Nag has completed a number of projects for the government of India and International Multilateral Agencies. His current research interest is international production networks, global value chains, trade in services (regulation), FDI flow, macroeconomic issues, regional trade agreements, and more. He is a member of the expert group on preferential rules of origin for the government of India and an external expert for the EC-Nepal WTO Assistance Programme.