Celso Amorim, a career diplomat, has been the longest serving foreign minister of Brazil to date (1993−1994 and 2003−2010). He also served as Minister of Defense (2011−2014). Amorim remains active in academic life and as a public figure, having written a number of books and articles on matters ranging from foreign policy to culture. One of his latest works, "Acting Globally, Memoirs of Brazil's Assertive Foreign Policy" was published by Hamilton Books with endorsements by Kofi Annan and Noam Chomsky. Amorim was a Visiting Fellow at Harvard Kennedy School in 2011 and 2015, and a Distinguished Fellow in King's College. He has participated in several think tanks, committees and panels on themes of global interest. In 2009 Foreign Policy Magazine referred to him as the "world best foreign minister". In 2010 he was ranked as number six of Foreign Policy Magazine's 100 Top Global Thinkers.