The Office of the UnitedStates Trade Representative (USTR) is the United States government agency responsible for developing and recommending United States trade policy to the president of the United States, conducting trade negotiations at bilateral and multilateral levels, and coordinating trade policy within the government through the interagency Trade Policy Staff Committee (TPSC) and Trade Policy Review Group (TPRG). http://en.wikipedia.org/wiki/Office_of_the_United_States_Trade_Representative
Ron Kirk was nominated by President Barack Obama to serve as U.S. Trade Rep and on March 18, 2009 and was confirmed by the U.S. Senate in a 92-5 confirmation vote. On January 22, 2013, Kirk announced that he would be stepping down as U.S. Trade Rep.
see related International Trade