Rosenberg, William (10 June 1916–20 September 2002), entrepreneur and founder of the Dunkin' Donuts restaurant chain, was born in the Dorchester section of Boston, one of the four children of Nathan and Phoebe Swart Rosenberg, who operated a neighborhood grocery. Growing up in one of only a few Jewish families in the tough, working‐class district, as a child Rosenberg was sometimes the target of anti‐Semitic verbal abuse and physical attacks. He left school after eighth grade to work in the family business, and after the failure of the business during the Great Depression he found jobs delivering telegrams for Western Union and driving a horse‐drawn delivery truck for Hood Dairy. Rosenberg's reputation as a tenacious worker won him a wholesale delivery route with the Jack and Jill Ice Cream Company, a pioneer in the use of refrigeration trucks, vending machine sales, and other innovations. His success in developing new business along the route brought him an office position at Jack and Jill, and Harry Winokur, the company accountant, became a mentor, teaching him formal business methods and facilitating his promotion, at age twenty‐one, to national sales manager....