Johannes Stein has been interested in software and game development for the better half of his life. He has used a variety of technologies, programming languages, and platforms. In the last few years, he worked as a freelancer using web and mobile technologies for a number of different companies and startups, working on several iOS apps and games. Among the technologies he uses are Sparrow, Cocos2D, and UIKit. He co-authored the book Irrlicht 1.7 Realtime 3D Engine Beginner's Guide, which was published in 2011 by Packt Publishing. He can be followed on Twitter @Stoney-FD.