Author of the Learn SpriteBuilder book published by Apress.
Developer of OpenGW, a game world simulation engines / entity component system with Model-View-Controller architecture that can be used with any rendering engine.
Developer of Kobold Kit, the Sprite Kit game engine with tilemap support, game components, scheduling and event dispatching, and all the other things missing from Sprite Kit.
Developer of KoboldTouch (commercial) and Kobold2D (free), both game engines build on cocos2d-iphone. KoboldTouch adds MVC and component support and even improves cocos2d's own features, such as Tilemap rendering.
Author of the Learn Cocos2D book series published by Apress. The latest edition "Learn cocos2d 2" uses cocos2d 2.0 with ARC enabled and also covers Kobold2D.
Steffen's main website is Learn Cocos2D.
Q&A for professional and enthusiast programmers
Q&A for professional and independent game developers
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Q&A for computer enthusiasts and power users
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for system and network administrators
Q&A for professional programmers interested in conceptual questions about software development
Q&A for apps, scripts, and development with the Stack Exchange API
Q&A for pro webmasters
Q&A for people studying math at any level and professionals in related fields
Q&A for passionate videogamers on all platforms
Q&A for members of the workforce navigating the professional setting
Q&A for peer programmer code reviews
Q&A for power users of Apple hardware and software