Headshots Photography in New York – recommmendations?

A friend of mine wants to try some corporate modeling – she works for the agency. I am going to need a portfolio! I’ve read on various forums (for actors and models) that this portfolio would be your playing card. It has to be done really well and professionally. I was recommended one headshot photographer – David Martin in Chelsea.
His portfolio on the website looks really sleek with nice colors – actors, celebrities but his prices seem to be very reasonable – $250 for a basic headshot session.
Has anybody worked with him before?
Any recommendation what else I need for the basic portfolio?