My day job was investing in early stage companies through Neu Venture Capital. I’ve also written a book with my friend Liz Zalman: Founder vs. Investor. And I teach entrepreneurship at Columbia University. I was a co-founder of venture-backed startup Root Markets, ran Omnicom Group’s venture capital division in the 1990s, and was once, long ago, a hardware design engineer on IBM’s S/390 series of mainframes where I designed a very small part of the central processor’s microcode execution engine, which is like the computer in the computer in the computer.