I submitted this but am neither the author nor subject. Like many, I've been awed by wingsuit videos (starting with Jeb Corliss several years ago), but this accident analysis is one of the first articles I've found that explains what goes into wingsuit training and ongoing practice. I must admit I've been tempted to try skydiving and learn to BASE jump, but never got started. This shows it is way more difficult and long to learn than I imagined.
It also ties in nicely with the related discussion 2 months ago: "Why are so many BASE jumpers dying?" (https://news.ycombinator.com/item?id=12418937)