Concepteur-rédacteur

Anyone who works in translation will tell you that there are certain words (or phrases) in French that have no direct equivalent in English - and vice versa. For example, la relève, coup de coeur and écoeurant. Or in English, there is insight and queer, among others.

But the term that causes the most difficulty for our copywriting room is concepteur-rédacteur.

For the 90 Degrees style guide, we've decided on creative copywriter, but I've also seen:

• concept editor
• advertising copywriter
• creative writer
• idea man
• and just plain copywriter

None of those formulations quite capture the French term though. Any suggestions? Or other words you would like to throw into the mix?