1. Research Assistant, NSF Center for Advanced Cement-Based Materials, Northwestern Univ., 2145 Sheridan Rd., Evanston, IL 60208-4400.
2. Materials Engineering Scientist, Saint Gobain Technical Fabrics, P.O. Box 728, St. Catharines ON, Canada L2R 6Y3.
3. Director, NSF Center for Advanced Cement-Based Materials, Northwestern Univ., 2145 Sheridan Rd., Evanston, IL 60208-4400.
4. Professor, Dept. of Industrial Engineering and Management Science, Northwestern Univ., 2145 Sheridan Rd., Evanston, IL 60208-4400.
5. Associate Director, National Institute of Statistical Sciences, P.O. Box 14006, Research Triangle Park, NC 27709-4006.