Coder, teacher, coach. Personal site at http://alexchaffee.com. Author of Code Like This. Co-creator of Pivotal Tracker. RailsBridge volunteer and curriculum wrangler. Founder and ex-CTO of Cohuman. Occasional Pivot and Carbonite.
Q&A for professional and enthusiast programmers
Q&A for linguists, etymologists, and serious English language enthusiasts
Q&A for computer enthusiasts and power users
Q&A for professional programmers interested in conceptual questions about software development
Q&A for power users of Apple hardware and software
Q&A for people studying math at any level and professionals in related fields
Q&A for cartographers, geographers and GIS professionals
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for power users of web applications
Q&A for passionate videogamers on all platforms
Q&A for user experience researchers and experts
Q&A for Information security professionals
Q&A for speakers of other languages learning English