Cold email? Start here.

If you’re thinking of cold-emailing me or asking to “pick my brain,” start here.

I’ve been writing online since 1998. I’ve built companies, invested in others, taught, experimented, and tried to write down what I was learning along the way. Many of the questions I get are already answered somewhere below.

This page is a comprehensive source guide. If you read a few of these first, your email will be sharper, more contextual, and much easier for me to respond to well.


Start Here


Books & PDFs

If you’re reaching out about startups, hiring, product, or careers, start with these.


Columbia Courses

I teach Columbia College undergraduate courses at Columbia University:

  • Venturing to Change the World – see the syllabus: PDF
  • Making History Through Venturing – see the syllabus: PDF

If you’re asking about startups, venture, or careers, those syllabi are a strong signal of how I think about building and history.


Selected Posts


Follow / Subscribe


If You Email Me

I genuinely like helping people. I also have a finite inbox.

The fastest path to a useful response:

  1. Read something above and reference it.
  2. Ask one specific question.
  3. Show your thinking and what you’ve already tried.

“Pick my brain” usually means “please do my thinking for me.”
A better move is: show me your thinking and ask for one correction.

This page exists so that high-leverage conversations start from shared context.

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