Zorro
Pseudonym of Harold Ward
True name for this pseudonym from Locus1 and from the <a href="http://en.wikipedia.org/wiki/Doctor_Death_%28magazine%29">Wikipedia</a> article on Dr. Death. It is very likely that more than one author worked under the pseudonym "Zorro" though, as I encountered this on AbeBooks: "ZORRO (Pseudonym for = Ernest H. Barbour, Arthur J. Burks, Harold Ward, & Rudolph Zirn)".