Smartphone security boffin. Author of Professional Cocoa Application Security and Test-Driven iOS Development; currently writing APPropriate Behaviour. Software engineering and security blogger.
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Server Fault
Q&A for professional system and network administrators
The Workplace
Q&A for members of the workforce navigating the professional setting
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
User Experience
Q&A for user experience researchers and experts
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Game Development
Q&A for professional and independent game developers
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Ask Different
Q&A for power users of Apple hardware and software
Physics
Q&A for active researchers, academics and students of physics
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Musical Practice & Performance
Q&A for musicians, students, and enthusiasts
Academia
Q&A for academics and those enrolled in higher education
Ask Patents
Q&A for people interested in improving and participating in the patent system