Respectfully, Sam, I'd encourage you to separate the media buying duties from those of business development. The media buyer can certainly work under the purview of the bizdev candidate, but the position is time-consuming and data-driven.
In order to successfully engage a media buyer, and to see meaningful results, this person will have to be developing experience-driven tests and using sophisticated tools to analyze the results. Having other duties (especially time-consuming duties) means that this buyer won't have the focus to make your media buying successful.
Done properly, and with an appropriate budget, you can make a killing with the right person.
I have a very strong candidate if you need a recommendation, but I know for a fact that they wouldn't want to do it unless that was the sole focus of the position.
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