Thad William Allen is a former admiral of the United States Coast Guard who served as the 23rd commandant from 2006 to 2010. Allen is best known for his performance directing the federal response to hurricanes Katrina and Rita in the Gulf Coast region from September 2005 to January 2006, and for his role as National Incident Commander of the Unified Command for the Deepwater Horizon oil spill in the Gulf of Mexico in 2010. Robert J. Papp Jr. succeeded him as Commandant on 25 May 2010.