It may seem self-serving for the long time CEO of an email agency to write about how to hire an agency. I certainly recognize that I am biased, but so is everyone. I will be as candid as possible. I also think that having worked for one for the world’s largest agency holding companies (NYSE:OMC — 75,000 employees, $16B annual revenue) for the last 14 years I have an uncommon perspective in the email space.