Ask Pmarca: Why the p in pmarca?

A reader asks:

Why the “p” in “pmarca”?

A long time ago, I had a wonderful, well-known boss — let’s call him Harry Slarr — who had two email addresses, “hs”, and “phs”. The former was for anyone to email him; the second was for a smaller group — “phs” stood for “Private Harry Slarr”.

At that time, nobody knew who I was and nobody cared, so I thought it would be funny to have my (sole) email address be “pmarca”, as in “Private Marc Andreessen”.

It stuck.