Kathy Sierra is the coauthor of Head First Java and Head First EJB. She has been interested in learning theory since her days as a game developer. More recently, she's been a master trainer for Sun Microsystems, teaching Sun's java instructors how to teach the latest technologies to customers. Her current gig, along with her partner Bert Bates, is developing and producing the bizarre new Head First series of books for O'Reilly. She's also the original founder of javaranch.com, which came dangerously close to winning a Jolt Cola award last year, but had to settle for the computer equivalent of being the Miss America runner-up (winning the Software Development Magazine Productivity Award instead). She likes to think about thinking (as opposed to actually DOING it), and blogs from time to time about metacognition, why having fun MATTERS, and why being an "individual contributor" (as Scott McNealy puts it) is way better than being a "manager".