JASON FRIED is the founder of 37signals, a privately held web-based software development company and the co-author of the international bestseller Rework. His motto is, ‘It's simple until you make it complicated’. DAVID HEINEMEIER HANSSON is the creator of Ruby on Rails, an open-source web framework on which hundreds of thousands of web applications have been built – including Twitter. He is also Fried’s business partner at 37signals and co-author of Rework. 37 SIGNALS is internationally renowned for its innovative web products, including Basecamp, Highrise and Campfire. Founded in 1999, 37signals has grown into a multi-million dollar company with over three million loyal customers. The company, based in Chicago, has been profiled in the Guardian, Time, Wired and Business Week.