The position has its origins in the Reciprocal Trade Agreements Act of 1934, which stipulated that the Secretary of Agriculture must be consulted when the Department of State conducted negotiations on agricultural trade. At that time the head of Foreign Agricultural Service of the U.S. Department of Agriculture, Leslie A. Wheeler, began to lead agricultural negotiations. His successors as heads of the Office of Foreign Agricultural Relations and the Foreign Agricultural Service continued this work until creation of the Office of the U.S. Trade Representative in 1962. Initially, USTR's agricultural negotiations were closely coordinated with the Administrator of the Foreign Agricultural Service, and in fact during the Kennedy Round of GATT negotiations FAS Administrator Raymond A. Ioanes served as the principal agricultural negotiator. By the late 1970s, however, such matters were handled by an Assistant United States Trade Representative for Agricultural Affairs and Commodity Policy who after 1978 was a career member of the Senior Executive Service. Over time this position evolved into a politically appointed Special Trade Negotiator for Agricultural and Food Policy who did not enjoy ambassadorial rank. During negotiation of the Uruguay Round of GATT talks that led ultimately to creation of the World Trade Organization, Charles J. O'Mara, a Senior Foreign Service officer of the Foreign Agricultural Service, was appointed Counsel for International Affairs to the U.S. Secretary of Agriculture and Special Trade Negotiator for Agriculture. According to Congressional testimony,
Though not employed by USTR, O'Mara thus effectively functioned as USTR's lead agricultural negotiator from 1990 until conclusion of the Uruguay Round.
Incumbents
In 1997, Peter L. Scher was nominated and confirmed to the rank of ambassador while serving as Special Trade Negotiator for Agriculture, the first time the position was elevated to that status. The Chief Agricultural Negotiator ambassadorship was formally created by the Trade and Development Act of 2000 while Scher was in the position, making him the first to bear the title. However, according to Senate records, the first formal nominee to the new ambassadorship was Scher's successor, Gregory M. Frazier, who was nominated to it October 19, 2000. Frazier was not confirmed by the Senate and was elevated to the ambassadorship from his position as Special Negotiator for Agriculture and Food Policy in a recess appointment on December 21, 2000. He was succeeded in turn by Allen F. Johnson and Dr. Richard T. Crowder. In March 2008, President George W. Bush nominated A. Ellen Terpstra to the post, but she was not confirmed. Dr. Islam A. Siddiqui was given a recess appointment in March 2010, and confirmed by the Senate on October 20, 2011. Dr. Siddiqui submitted his resignation December 12, 2013. On December 17, 2013, President Barack Obama nominated Darci Vetter to succeed Dr. Siddiqui. She was confirmed to that position by voice vote on July 9, 2014.