William Rosenberg founded Dunkin' Donuts in 1948 in Quincy, Massachusetts, demonstrating entrepreneurial skills from a young age. By selling ice chips at the racetrack as a teenager during the Great Depression, he brought home $171. Dunkin' Donuts grew to over 10,000 stores worldwide by the end of 2011, and plans further expansion to 15,000 US stores by 2020, showing Rosenberg's success in building a global business from humble beginnings.