EunSook has been with the AAPI Civic Engagement Fund since its establishment in 2014. Prior to that she coordinated the 2012 National AAPI Civic Engagement Project for the National Coalition for Asian Pacific American Community Development. She also supported Unbound Philanthropy, the Four Freedoms Fund and other funders on initiatives related to administrative relief and the DACA program. She is the former senior deputy for Congressmember Karen Bass, executive director of the National Korean American Service & Education Consortium (NAKASEC), executive director of Korean American Women In Need, and station manager of CKLN Public Radio in Toronto, Canada.

EunSook was born in Hwasoon, South Korea and immigrated to Canada at a young age. As a teenager she founded Youth Against Apartheid with her peers and together successfully campaigned for the Toronto School Board to divest from South Africa, among other efforts. She arrived in the United States in 1993 and became active in the movement for democracy, reunification, and peace in Korea as a member of Young Koreans United of USA.