<Present>
Member of the 20th and 21st National Assembly (Two-Term Member, Democratic Party of Korea Representative for Gyeonggi Namyangju City)
Vice Chair, Committee on Trade, Industry, Energy, SMES, and Startups, the National Assembly
Standing Secretary of the Korea-Japan Parliamentarians'
President of the National Assembly's Peace Forum on the Korean Peninsula
Chair, Committee on International Affairs, Democratic Party of Korea

<2003-2022>
2020 – 2022 Member of the National Policy Committee, the National Assembly
2021 – 2022 Member of the Special Committee on Budget & Accounts, the National Assembly 
2020 – 2021 Head of the COVID-19 National Crisis Management Division, Democratic Party of Korea
2020 – 2021 Chief Vice President of the Policy Committee, Democratic Party of Korea
2020 Member of the Korean Peninsula Task Force, Democratic Party of Korea
2018 – 2019 Member, Special Committee on Inter-Korean Economic Cooperation, the National Assembly
2016 – 2017 Deputy Floor Leader of the Democratic party, the National Assembly
2013 – 2015 Visiting Professor, East Asia International College, Yonsei University
2010 – 2011 Professor, Graduate School of Social Policy, Gachon University
2006 – 2007 Visiting Scholar, the East Asia Center, Cornell University
2003 – 2005 Secretary General, Forum of Democratic Leaders in the Asia-Pacific (FDL-AP)
2003 – 2005 Chief of Staff to Kim Dae-jung, Former President of Republic of Korea
2000 Member of the Delegation to the Inter-Korean Summit in 2000 (President Kim Dae-jung, Pyeong-yang)
1999 – 2003 Senior Private Secretary to President Kim Dae-jung