I like to make myself available as needed by the team to think through early stage ideas, product/market fit, business model, pricing, distribution, etc... as well as CEO / mgmt team coaching if needed. I'm always happy to help at inflection points, e.g. financing or exits.
He knows the startup world from every angle. He's angel invested his own funds, founded and run his own companies, worked for seed-stage venture funds. Well connected, friendly, calm, insightful, and stays ahead of the curve.