I work in the same building as Gregg but never knew anything about his art until recently when I ran into him at a yard sale. He had some of his work on the ground for sale beside an electrocutable Marv (Sin City) figure, old school Nintendo units, and a bunch of other randomness.
His collage art doesn't shy away from violence or sexuality while still being playful. Perhaps it's just the unexpectedness of finding such in the heart of the bible belt, but I like it.
He's working on a web site, hopefully it will have better quality photos.