This is from the invaulable site RARA-AVIS:
RARA-AVIS: Re: Trinian
From: Max Gilbert ( email@example.com)
Date: 17 Jan 2005
Thanks. At least a serach on "Zekial Marko" shows up some more information--it seems he went on to write scripts for the Rockford Files and Kolchak: The Night Stalker. I'll have to pick up ONCE A THIEF (which was also a French film with Alain Delon).
--- In firstname.lastname@example.org, "Juri Nummelin"
> Re: John Trinian.
> John Trinian was a working name of Zekial Marko. He was a former
> convicted criminal who started publishing when he got out of jail
> in the early sixties. His first novel was under his real name
> (Scratch a Thief, Fawcett Gold Medal 1961, also as Once a Thief),
> after which he started using the pseudonym. As Trinian, he
> published five or six novels with various paperback houses, such
> as Pyramid.
> Scratch a Thief is an excellent novel, you should try it. That's
> the only book I've read by him, sadly, so I can't comment on the
> others. I remember Bill Crider commenting on Trinian before.