Sungsup is Chair of the Education Sector Group in ADB. Since joining ADB in 2001, he worked as Director, Pacific Strategy and Special Operations, Pacific Department, Senior Advisor to the Managing Director General, and Deputy Country Director for Bangladesh and Nepal Country Offices. Prior to ADB, he worked with public and private entities such as Samsung and Korean National Pension. He also taught at leading universities in Japan, South Korea, and the United States. He is a regular contributor to news media and conferences on economic and development issues. He is a member of the International Advisory Board of the Journal of Asia-Pacific Economy.