The guy teaching the acting class was the same guy the plays Sam Weiss (the bowling guru) on Fringe.
Watch that first step! It's a DOOOOOZIE!
He wrote a cool essay
about his appearance on the show.
I wish I could write "essays" that short.
In all seriousness though, I wouldn't have known from looking at him in the episode that he had only recently had life threatening surgery. Lets hope he gets back up to 100% soon.