Who made the Louisiana Purchase?

US President Thomas Jefferson was in office when his minister in Paris informed him that Napoleon was interested in selling New Orleans and the entire Louisiana Territory to the United States. Jefferson realized that this would be a good transaction for the USA. The city of New Orleans guarded the entry to the Mississippi River. By making the deal, France was out of North America and Great Britain had no chance of capturing New Orleans with the US owning it.

Thomas Jefferson is the president who sponsored the Louisiana Purchase. Robert Livingstone and James Monroe were Jefferson's emissaries who actually made the deal with Napolean in 1803.