Nope. Sometime around 2003 I called the company he used to work for. They said he'd left just months earlier, and they didn't know how to reach him. I hope he's ok.
Last time I saw him was on the street in NYC, maybe 1991 or so. He asked if he could borrow money. I gave him a $50 I happened to have in my wallet (I usually don't carry large bills, so it was weird) and handed it to him and said "Keep it. To be honest, I don't expect to see this money again. If you pay me back, fine, but don't worry about it. Just stay safe." I wish now that I'd offered him a place, or gave him my phone number.