1. Assistant Professor, Dept. of Civil Engineering, Carnegie Mellon Univ., Pittsburgh, PA 15213-3890.
2. Associate Professor, Dept. of Civil and Environmental Engineering and (by Courtesy) Computer Science, Director, Center for Integrated Facility Engineering, Stanford Univ., Stanford, CA 94305.
3. Senior Research Associate, Center for Integrated Facility Engineering, Stanford Univ., Stanford, CA 94305.
4. Professor, Dept. of Civil and Environmental Engineering, Stanford Univ., Stanford, CA 94305.