I spy Adam Lisagor.. or some similarly bearded man. He worked on Square and Birdhouse's videos.

Square: http://www.youtube.com/watch?v=iBieYjxUj5Q

http://www.youtube.com/watch?v=J2_u2nMsgjg

http://www.youtube.com/watch?v=QSzsFAJAKHI .. wow square has a lot of videos

Birdhouse: http://www.youtube.com/watch?v=S8yRaWY1xV8&feature=playe...