I'm involved in computer typesetting and TeX since the mid 80's, leading the LaTeX development since the the beginning of the 90's. You'll find my professional profile here. An interview jointly conducted by TUG and the Free Software Magazine on my involvement in LaTeX can be found here.
One of them, "The LaTeX Companion 2ed" is also available as an eBook. It can be obtained directly from the publisher as a bundle containing pdf/epub/mobi without DRM. Check out the news item on the LaTeX Project site for details.
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for professional and enthusiast programmers