Web designer and programmer.
Personal site: http://zhangwenli.com
Q&A for professional and enthusiast programmers
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for people studying math at any level and professionals in related fields
Q&A for user experience researchers and experts
Q&A for power users of web applications
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Q&A for linguists, etymologists, and serious English language enthusiasts
Q&A for professional programmers interested in conceptual questions about software development
Q&A for computer enthusiasts and power users