The correct answer is: John Jay
The formal name of the treaty is: The Treaty of Amity, Commerce, and Navigation, Between His Britannic Majesty and the United States of America, but it is also known as the Jay Treaty. The main purpose of this treaty was to relieve post-war tension between Britain and the United States. It was signed on November 19, 1794.
George Washington was president by the time and Alexander Hamilton designed the treaty but it was John Jay who negotiated it.