John Verpoorten
John Verpoorten ( May 15 , 1940 – December 15 , 1977 ) was an American comic book artist and editorial worker best known as Marvel Comics' production manager during the latter part of the Silver Age of Comic Books and afterward , during a seminal period of Marvel's expansion from a small publishing concern to a multinational popular culture corporation . 
<triplet> John Verpoorten <subj> May 15, 1940 <obj> date of birth