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Thomas Edward Donilon (born May 14, 1955) is an American lawyer, business executive, and former government official who served as the 22nd National Security Advisor in the Obama administration from 2010 to 2013. Donilon also worked in the Carter and Clinton administrations, including as chief of staff of the U.S. State Department. He is now Chairman of the BlackRock Investment Institute, the firm's global think tank. Wikipedia