At the 2009 TED, Hanson Robotics showed our collaboration with UCSD Machine Perception Lab (Javier Movellan, Marian Bartlett, Nick Butko, Jake Whitehill, Paul Ruvolo). This robot tracks faces and sound, percieves facial expressions, and mimics the facial expressions. Our belief is that understanding human expressions can help to model human empathy and enable machine empathy.