found him!

To know what the Organic Chemistry Head GSI John looks like, you can see it in snarfed.org, under the draw group. I hope he doesn't mind I linked to his pictures . . .

Some of the students were telling him to cut his hair, so he told everyone that he used to have a mullet, which is almost like having a long hair, except that the hair on top can be short, long, or even non-existent. You can see him in his mullet in the blue shirt.