Great marketers do that. If you're considering one branch of marketing, Promotion and Marketing Communications in this case, you may be missing a deeper opportunity.
Mar Comm is a tool of the trade and is a small part of good marketing, it's the most outwardly visible however. If your quest is for a megaphone you may have better luck seeking a PR or communications type person than a marketer.
If you're looking for someone with a holistic view towards marketing, want them to drive your strategy, and do the heavy lifting then I'd advise finding someone who is very experienced in marketing from a business development type role to assist in identifying and selecting the right person for you.
That may not be the answer you're looking for but I don't think there's a shortcut here that will be successful. We humans are terrible at assessing the skill of others in a field we have no direct experience in.