It was in his role as a milkshake machine salesman that Kroc first became involved with McDonald’s, a restaurant chain based in San Bernardino, California. The McDonald brothers were clients who had purchased multiple mixers. Grasping the franchising potential of McDonald’s, Kroc offered to work as a franchising agent for a cut of the profits. Ultimately, Kroc’s ambitions for the restaurants eclipsed those of the McDonald brothers. In 1955, Kroc became president of the McDonald’s Corporation. He bought out the owners entirely six years later. In 1977, after leading McDonald’s past archrival Burger King, Kroc reassigned himself to the role of senior chairman. He held this position until his death in 1984.