Regular GM for a longrunning group, and occasional GM for others. I mostly run homebrew stuff, and tend to house-rule extensively even when I don't, but I do my best to be friendly about it. I'm here to make a better game for my table, not to screw over my players.
I also enjoy playing on occasion. I tend to play talky and fighty characters, and I have an unfortunate tendency to make requests of my GMs, so an open mind and a willingness to say both "yes" and "no" are preferred.