Josh Clark is a designer specializing in multi-device design, strategy, and user experience. He's author of four books, including "Tapworthy: Designing Great iPhone Apps" (O'Reilly, 2010) and the forthcoming "Designing for Touch" (A Book Apart, 2015). Josh's agency Global Moxie offers design services, strategic consulting, and training to help creative organizations build exceptional interfaces for apps, websites and connected devices. His clients include AOL, Time Inc, eBay, O'Reilly Media, and many others.

Before the internet swallowed him up, Josh was a management consultant at Monitor Group in Cambridge, Mass, and before that, a producer of national PBS programs at Boston's WGBH. He shared his three words of Russian with Mikhail Gorbachev, strolled the ranch with Nancy Reagan, hobnobbed with Rockefellers, and wrote trivia questions for a primetime game show. In 1996, he created the uberpopular "Couch-to-5K" (C25K) running program, which has helped millions of skeptical would-be exercisers take up jogging. (His motto is the same for fitness as it is for software user experience: no pain, no pain.)