Dan York has been writing, speaking and teaching about online communication technology since the mid-1980s. In 1998 he co-founded the Linux Professional Institute (LPI), today the leading global certification program for Linux professionals, and later served on the Board of Directors of Linux International. He s written multiple books on Linux and networking; created some of the first courseware about creating web sites back in the early 1990 s; developed open source software in many languages including python, perl, LISP and most recently Node.js; and worked with more XML variants than he can...