He is one of those extremely rare programmers of the "too smart to need unit tests" type and he can come up with paradigm shifting code by hacking on something in a weekend.
All his utilities were fully dependency free, straight up C code that compiled something epic into a 50kb executable. Back in the day I had a job which paid a substantial bonus for every kilobyte that I managed to shave off the executable binary size ( 14.4 baud modem days ) and his code as well as all the code from the 4k and 64k demo scene that was available was my only reference material.
I lost track of what he is up to these days, but I hope he found much happiness after the apparently tough AOL time.
I thought I was pretty good until I worked with the guy who made Winamp. It took me a couple weeks to make some enhancements to their add-ons site. It took him a couple weeks to write his own version of Pro Tools.
And the bittorrent came and overtook all of them pretty quickly.
The file-sharing scene looked calm from the outside, but on the inside the wars and the intrigues were vicious.