This man spent 40 years working on BSD. His code appears in #FreeBSD, #OpenBSD, #NetBSD, and everywhere.
If you have used the Internet, you have used code he wrote.
RIP, sir. You changed the world for the better.
What's probably his last talk: "I don't have much to say," followed by a spellbinding eighty minutes. https://www.youtube.com/watch?v=XSziyKlG1ws
He was a PhD candidate in Molecular Biology at Berkeley and that's how he discovered UNIX.
Never finished his PhD.