Thomas M. Harrigan was the Deputy Administrator for the United States Drug Enforcement Administration (DEA) and a DEA Special Agent for nearly 25 years. He was nominated by President Barack Obama to the position of DEA Deputy Administrator on February 18, 2011. He was confirmed as DEA Deputy Administrator by the United States Senate on March 29, 2012. He was appointed as DEA's Chief of Operations in 2008 and is a principal advisor to DEA Administrator Michele M. Leonhart on all enforcement-related matters.