Yes, this is a shot of Jason Alexander on Harry's Law. He brought the series to the episode "Bad to Worse."
Added:
Yes, this is Jason Alexander with hair. The actor guest stars on Harry's Law as a teacher.
Added:

Harry's Law Season 2 Episode 5 Quotes

He was let go due to budget cuts, know how I know? Because right here [points] it says "budget cuts".

Principal

Cross: I have a rather serious matter to discuss if you don't mind.
Harry: I do actually, beat it. I'm not receiving today.