1. Research Professor, School of Policy, Planning and Development, Univ. of Southern California, RGL Room 230, Los Angeles, CA 90089-0626; formerly, Pennsylvania State Univ., University Park, PA 16802 (corresponding author).
2. Research Associate Professor, Dept. of Civil, Architectural, and Environmental, Univ. of Colorado, Boulder, CO 80309.
3. Assistant Professor, Dept. of Sociology, Univ. of North Texas, P.O. Box 311157, Denton, TX 76203.
4. Technical Director, RMS, 415 Fox Chase Circle, Alpharetta, GA 30005.
5. Vice President, ImageCat, Inc., Union Bank of California Building, 400 Oceangate, Suite 1050, Long Beach, CA 90802.