Feith served as U.S. Under Secretary of Defense for Policy under President George W. Bush from 2001 to 2005.

He supervised the Pentagon's Office of Special Plans, and is described as a key architect of the 2003 U.S. invasion of Saddam Hussein's Iraq.

• He served on the board of D.C.-based pro-Israel lobby and think tank Jewish Institute for National Security of America (JINSA).