Mark Tilden is a well known robotics expert in the US who has worked for NASA? and the US Government. He has some weight in the BEAM Robots community, and is also responsible for the RoboSapien.
He has come up with the "nervous neuron" and his BICore? technology. In terms of robotic designs and creations he is fairly prolific, and responsible for whole communities. His perspective on robotic design is both refreshing and enlightening.