Still can't find much on Paul Parker.
DC Database says, '22 Mar 2019 ... Personal History of Paul Parker is unknown. Professional History of Paul Parker is unknown' Damn! I hate Mysteries.
He seemed to like Noir work.
Worked with Gardner Fox on tales in MANHUNT, for magazine enterprises. Also in KILLERS for the same publisher. Also did some work for Fox inc. Phantom Lady. And some fifties work for DC [My Greatest Adventure, House of Secrets] His editor for all of that probably would have been Fox.
Cheers!
Link to the book:
A-1 Comics 022 - Dick Powell