In 1955, Ray Kroc, a businessman, joined the company as a franchise agent and proceeded to purchase the chain from the McDonald brothers. McDonald's had its original headquarters in Oak Brook, Illinois, but has approved plans to move its global headquarters to Chicago by 2018.

McDonald's is the world's largest restaurant chain by revenue, serving over 69 million customers daily in over 100 countries across approximately 36,900 outlets as of 2016. Although McDonald's is known for its hamburgers, they also sell cheeseburgers, chicken products, french fries, breakfast items, soft drinks, milkshakes, wraps, and desserts.

According to a BBC report published in 2012, McDonald's is the world's second largest private employer (behind Walmart with 1.9 million employees), 1.5 million of whom work for franchises. The present corporation credits its founding to franchised businessman Ray Kroc in on April 15, 1955.

According to wikipedia