EXPERTS ARE DIFFERENT FROM MENTORS. All mentors are experts to some degree, but few experts are mentors. An expert has deep and narrow knowledge, but has not had entrepreneurial success or leadership experience in startups: they are superb at solving specific technical questions. Mentors are successful entrepreneurs who also have deep sector knowledge, although usually not as deep as experts. They are excellent guides for CEOs and founders in High Tech startups. When seeking advice, it is sound policy to separate these categories. Experts belong on SABs, Mentors on boards.