William Rosenberg was the food franchising pioneer who founded the Dunkin’ Donuts chain and saw it spread from coast to coast and into 37 countries.  Family links:  Parents:  Nathan Edward Rosenberg (____ – 1955)  Phoebe Swart Rosenberg (1891 – 1992)  Spouse:  Bertha Greenberg Rosenberg (1914 – 2008)* *Calculated relationship