With NASA, ESA, and DLR, David headed one of the most spectacular space missions ever with the Spaceshuttle Columbia's STS-55 flight, ESA's Spacelab, and DLR's autonomous and teleoperated robot. David has held Prof. positions in Florida, California, and online in the U.S. and was also supervising graduate theses in Europe. With the space industry, David has designed and built communications and navigation satellite technology and complete operational systems.