He's well-known around here, participated a lot in BTC businesses and he was pretty active too. Around 6000 posts I think. His TYGRR business was also pretty big on GLBSE too. I don't know if the link between TYGRR and GLBSE is part of the reason, but I don't really like how this is handled right now. You can't simply ban somebody because you have different business views.

*EDIT*

Ok, it seems he got into a fight with theymos over the GLBSE stuff.