June 10, 1916, was the birthday of William Rosenberg, the Boston-born entrepreneur who established the Open Kettle doughnut shop in Quincy, Massachusetts, in 1948, which two years later changed its name to Dunkin’ Donuts. Nearly 100 years after his birth, at the end of 2011, there were more than 10,000 outlets of the chain, one of the pioneers in name-brand franchising, in 32 countries.