Jack Dorsey is the CEO of Square, which he co-founded in 2009. Square is a revolutionary service that enables anyone to accept credit cards anywhere. The company offers a free credit card reader that plugs into a phone or iPad. The New York Times called Square “beautiful, simple and a joy to use,” and it was named one of the “Best Inventions of 2010” by Time magazine. Dorsey is also the creator, cofounder, and Chairman of Twitter. He was recognized as one of Time’s 100 most influential people and was named an “outstanding innovator under the age of 35” by MIT’s Technology Review.