Harrill is the founder of two international non-profit organizations: Youth Service International, based in Washington, DC, and its European partner, Demokratikus Ifjusagert Alapitvany (DIA), located in Budapest. Between 2003 and 2008, Harrill was a visiting professor of political studies at Bard College, where he also served as the Director of Bard\\\'s Program on Globalization and International Affairs (BGIA). While presiding over the growth of BGIA, he helped to adapt the program model to the Central European University in Budapest and the University of the Witswatersrand in Johannesburg.

Harrill has been a researcher on international youth policy at Columbia University, Senior Fellow at the Bonner Foundation, a member of the board of directors of the Campus Outreach Opportunity League, and a Peace Corps Volunteer. He has also served as a consultant on youth policy to the International Foundation for Election Systems, Open Society Institute, and Ford Foundation. He has a BA and JD from the University of North Carolina at Chapel Hill and has been with PILI since 2008.