William Rosenberg opened the first Dunkin' Donuts shop in 1950 in Quincy, Massachusetts. Dunkin' Donuts grew to become one of the largest coffee and baked goods chains in the world, with over 12,000 locations across 36 countries. The company has changed ownership multiple times, being acquired by Allied Lyons in 1990 and going private in 2005 before becoming independent again in 2012. As both a donut and coffee seller, Dunkin' Donuts' main competitors include other fast food chains and coffee shops like Starbucks, Tim Hortons, and McDonald's.