In 1803, who was sent to Paris to buy New Orleans?

In the year 1803 president Thomas Jefferson sent James Monroe to France for negotiating the purchase of New Orleans. The purchase agreement of New Orleans was later known as the Louisiana Purchase. The decision of selling the claims of the French in the Mississippi valley was a strange decision by Napoleon. Robert Livingstone was also a part of this negotiation process. There was also several American settlers and also traders already present in the region before the agreement and the handing over of New Orleans took place.