Prior to coming to Georgetown, Heffern served as Acting Assistant Secretary of State for European and Eurasian Affairs. Previously, he served as U.S. Ambassador to Armenia from 2011-2014, Deputy Chief of Mission (DCM) at USNATO in Brussels and DCM in Jakarta, Indonesia. Heffern also served in Tokyo, Malaysia, Abidjan, Ivory Coast, and China. After a 36-year Foreign Service career, Heffern retired from the State Department in April 2018. He and his wife, Libby, have five adult children and four grandchildren.