Richard Allen Stengel (born May 2, 1955) is an American editor, author, and former government official. He was Time magazine's 16th managing editor from 2006 to 2013. He was also chief executive of the National Constitution Center from 2004 to 2006, and served as President Obama's Under Secretary of State for Public Diplomacy and Public Affairs from 2014 to 2016. Stengel has written a number of books, including a collaboration with Nelson Mandela on Mandela's autobiography, Long Walk to Freedom.