Fritz Kahn Fritz Kahn Fritz Kahn (29 September 1888 – 14 January 1968) was a German Jewish physician who published popular science books and is known for his illustrations, which pioneered infographics. Fritz Kahn was born in Halle an der Saale, Germany, the son of Arthur Kahn, a physician and author, and Hedwig Kahn, "née" Schmuhl. His father emigrated to the USA shortly after his birth, settling in Hoboken, New Jersey. Around 1893, after establishing his practise, he sent for his wife and son, and Fritz Kahn started school there. The family later moved to Manhattan, but in 1895 his mother returned
Leo Kahn (entrepreneur) become a professor at Boston University. Kahn married his first wife, Dorothy Davids, in 1963 and had three children. The family resided in Chelmsford, Massachusetts, until Dorothy Kahn's death in 1975. Leo Kahn continued to operate his family's wholesale food distributor. However, he also launched a new grocery retailing division, which became known as Purity Supreme. The company initially opened small groceries, but then expanded to supermarkets. The Purity Supreme company also included the Heartland Foods Warehouse, which was called "the first successful deep-discount warehouse supermarket in the country" by Inc Magazine. One Kahn's biggest rivals was Thomas G. Stemberg,