Donald Mackenzie, representing the North West Company, held a rendezvous in the Boise River Valley in 1819. The rendezvous system was later implemented by William Henry Ashley of the Rocky Mountain Fur Company, whose company representatives would haul supplies to specific mountain locations in the spring, engage in trading with trappers, and bring pelts back to communities on the Missouri and Mississippi rivers, like St. Louis, in the fall. Ashley sold his business to the outfit of Jedediah Smith, Jackson, and Sublette. He continued to earn revenue by selling that firm their supplies. This system of rendezvous with trappers continued when other firms, particularly the American Fur Company owned by John Jacob Astor, entered the field.