Hi Elizabeth, that's Lucas de Groot's Thesans:
http://www.lucasfonts.com/fonts/thesans/

I’ll move this thread to the appropriate place, the Type ID Board.

Theunis’ picture is Pill Gothic. I’m not sure what it does here, though.

Edit: Nevermind. He was only directing you towards the right forum. That ad doesn’t display everytime you load Typophile.