Original sentence: Blinken has held senior foreign policy positions in two administrations over two decades.From 1994 through 1998 Blinken was Special Assistant to the President and Senior Director for Strategic Planning and NSC Senior Director for Speechwriting.From 1999 to 2001 he was Special Assistant to the President and Senior Director for European and Canadian Affairs.From 2009 to 2013 he served as Deputy Assistant to the President and National Security Advisor to the Vice President.He is the author of ‘’Ally Versus Ally:  America, Europe and the Siberian Pipeline Crisis’’ (Praeger, 1987).He served on the United States National Security Council staff at the White House from 1994 to 2001.He was also a Senior Fellow at the Center for Strategic and International Studies.In 2002 Blinken was appointed Staff Director for the U.In 2008, Blinken worked for the presidential campaign of Senator Joseph Biden, and was a member of the Obama-Biden Presidential Transition team.In this position he also helped craft U.Senate Foreign Relations Committee, a position he served in until 2008
Edited sentence: Blinken has also been a senior fellow at the Center for Strategic and International Studies in Washington, a foreign policy think tank.During the Clinton Administration in the 1990s, Richard Holbrooke,then assistant secretary of state for European and Canadian affairs hired Blinken, and White House speechwriter Robert Boorstin brought Blinken into the National Security Council.He also helped craft U.In 2008, Blinken worked for the presidential campaign of Senator Joseph Biden.In January 2013, President Obama appointed Blinken to the post of Deputy National Security Advisor