1. Assistant Professor, Dept. of Civil and Environmental Engineering, Stanford Univ., 240 Terman Engineering Center, Stanford, CA 94305; formerly, Research Associate, ETH Zurich.
2. Professor, Chair of Risk and Safety, Swiss Federal Institute of Technology, ETH Zurich; Wolfgang-Pauli-Strauss 15, HIL E 23.3, CH-8093 Zurich, Switzerland.