A civil engineering professor at the University of California at Berkeley is working on a novel way of maintaining a building's structural stability after an earthquake or terrorist bomb. The team of researchers working with the professor have designed and tested a system that uses cables for backup support in case main support beams failed. This site is the homepage of the professor leading this research. A number of projects on which he is currently working are described, as well as an ongoing investigation into the World Trade Center collapse. A couple conference papers are also provided online.