Charles A. Duelfer replaced David Kay on January 23, 2004 as the leader of the Iraq Survey Group, which was the United States' search for weapons of mass destruction in Iraq. His investigation has uncovered several bribes in the Oil for Food program, numerous violations of proscribed weapons research and facilities, but no stockpiles of weapons of mass destruction.
He served as deputy executive chairman of the UN Special Commission on Iraq from 1993 to 2000 and deputy head of the United Nations weapons inspections team from 2003 to January 23, 2005.
His name is commonly given to the final report of the Iraq Survey Group, the Duelfer Report.