Deletion of Howard Burton

Comment: As nominated the article had no independent sources but I just added four. There's a case to be made for #C6, but I think that (when viewed as a whole together with his work at Perimeter) the book reviews I added for his book are enough for . I also added a source for his post-perimeter work. There are three separate things here (heading Perimeter, writing a book, and founding a web site) so I don't think there's a BIO1E problem
Stance: keep
Cited policy: Wikipedia:Notability (WP:PROF||WP:AUTHOR)

Comment: per  and 
Stance: keep
Cited policy: Wikipedia:Notability (WP:AUTHOR||WP:GNG)