Investing.com - Chipotle's Steve Ells can count himself among the many impressive entrepreneurs to step down as CEO of the company he founded.Since the modern tech boom, it has happened with the founders of such groundbreaking companies as Apple (NASDAQ:AAPL), Cisco, Yahoo (NASDAQ:AABA), Google (NASDAQ:GOOGL) and eBay . More recently, CEO founders were replaced at a new generation of trailblazing companies, such as Twitter, Pandora, Zynga and Reddit. Most, like Ells. agreed to give up their jobs, either because they wanted a seasoned, professional manager at the helm or because a decline in the company's fortunes dictated change. Others were forced out of their roles by unhappy investors or boards.Ells, however, might want to keep his CEO skills sharp,.Founders have been known to make comebacks at their own companies.Jack Dorsey, for example, is back at Twitter, and Steve Jobs' second stint at Apple is the stuff of legend.
