Ask HN: Where do you find the business development people?

I have been doing both business development (marketing/sales) and development on my own now for awhile. My company is gaining traction but I am now at the point where I really need an expert in getting the next client and helping to develop a market, while I focus on making sure we are closing deals and developing what the clients want. Where do you turn for this type of person? What do you look for? And what skill sets would you advertise for?