Also one of the few people who can be known simply by his initials. The only other two I can think of off the top of my head are ESR and GvR (Eric S. Raymond and Guido van Rossen, for those not in the know).
Guido van RossUM
DHH
JWZ
pg
I feel like ESR, RMS and GvR would be recognised in just about every hacker-hangout. PG, outside of HN (and maybe some other places), not so much.
(Of course, it's self-reinforcing. People know ESR by his initials because that's how other people refer to him, and you can refer to him by his initials because people will know who you're talking about.)