Thad William Allen is a retired United States Coast Guard admiral who served as the 23rd Commandant of the Coast Guard. Allen is best known for his widely-praised performance directing the federal response to Hurricanes Katrina and Rita in the Gulf Coast region from September 2005 to January 2006. Robert J. Papp, Jr. succeeded him as Commandant on May 25, 2010, in a change of command ceremony.
Following his position as commandant, Allen continued to serve on active duty for 36 days in his role as National Incident Commander of the Unified Command for the Deepwater Horizon oil spill in the Gulf of Mexico. Allen officially retired from the U.S. Coast Guard on June 30, 2010, but continues to serve as a civilian as the National Incident Commander of the Deepwater Horizon oil spill. He is a senior executive on the staff of DHS Secretary Janet Napolitano.
Source - http://en.wikipedia.org/wiki/Thad_Allen