BA in Politics, Cambodia; 1991, PhD in Political Science, National Political Academy, Hanoi. Formerly: part of movement which liberated Cambodia in 1975; 1977, led movement aimed at liberating Cambodia and its people from genocidal regime; 1978, Founding Member, United Front, National Salvation of Kampuchea; 1979-93, positions in Cambodian Administration; 1979, Foreign Minister; 1981-85, Deputy Prime Minister and Foreign Minister; 1985-91, Prime Minister and Foreign Minister; 1993-98, Co-Premier then second Prime Minister of first coalition government; 1998, Vice-President, Cambodian People's Party and Prime Minister of Cambodia. Member, Academy of Natural Sciences, Russia. 2002, ASEAN Distinguished Honorary Fellow Member. Honorary doctorates. Recipient of awards including: Lifting Up the World with a Oneness Heart Award, International Peace Center (2001).