Ray Kroc was an American businessman who founded the McDonald's Corporation. He is credited with transforming the fast food industry by introducing the concept of franchising and creating a global chain of restaurants. Kroc opened the first McDonald's restaurant in 1955 and went on to become one of the most successful entrepreneurs of the 20th century. The term 'Ray of McDonald's' is a reference to Kroc's legacy and his role in the success of the company.