Recently I discovered his book on Amazon, Anatomy of a Studio Portrait. Usually a title like that means the basics - exposure, composition and lighting. Well, John never does anything halfway and this book is one of the most thorough I've ever read.
There are thirteen chapters covering all the ingredients to consider when creating a stunning portrait, even the backdrop, aspect ratio and depth of field.
However, the most fun for me when it comes to friends in this industry is digging back to their roots. From 1985 to 1991, ABC, A&E, and The Travel Channel aired a weekly half-hour TV show for photographers called “World of Photography.” I went and did a little digging and found the video of John below from thirty years ago.