Jeff has a wealth of great experience and has proven to me that he can apply it in a startup environment as a CTO. He's one of those rare "devs" that can do hand's-on engineering at any level of the software stack, from low-level systems level stuff, to scalable cloud services, to front end UI. In addition he has no trouble popping up to the 10,000 foot level to ensure there's a solid architecture in place.
And he's an absolute pleasure to work with. He demonstrates high-integrity in all he does, works extremely hard, and loves what he does.