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John Sculley, who ran Apple from 1983 to 1993, was a marketing and sales executive from Pepsi. He focused more on profit maximization than on product design after Jobs left, and Apple gradually declined. “I have my own theory about why decline happens at companies,” Jobs told me: They make some great products, but then the sales and marketing people take over the company, because they are the ones who can juice up profits. “When the sales guys run the company, the product guys don’t matter so much, and a lot of them just turn off. It happened at Apple when Sculley came in, which was my fault, and it happened when Ballmer took over at Microsoft.”