Romeo Brown was a British comic strip published in the Daily Mirror from 1954 to 1962.

It featured the adventures of Romeo Brown, a dashing private detective and reluctant ladies' man.

O'Donnell recalled in a 2002 interview: "This was a strip running in the tabloid Daily Mirror, for which I was writing "Garth".

The editor was dissatisfied so he engaged Jim Holdaway to take over the drawing and asked me to write the scripts.

"[2] O'Donnell followed Romeo Brown with the comic strip Modesty Blaise in the Evening Standard, which Holdaway illustrated from its debut on 13 May 1963 until his death in 1970.