Mister Donut
In 1955, Harry Winokur worked with brother-in-law William Rosenberg, the founder of Dunkin' Donuts (now Dunkin'). After Winokur broke his partnership with Rosenberg, he went on to create Mister Donut with his son-in-law David Slater that same year, with stores in most of North America. The Mister Donut business became so popular that Winokur and Slater decided to go into franchising. As a result, Mister Donut began a rapid expansion that resulted in the opening of 275 stores in the U.S. and Canada. In 1970, Minneapolis-based International Multifoods Corporation, one of the world's largest and most successful food companies, acquired Mister Donut and its franchising concept from Winokur.