1. R. A. Matzner is professor of physics and director of the Center for Relativity, University of Texas, Austin, TX 78712, USA.
2. H. E. Seidel is senior research scientist at the National Center for Super Computing Applications (NCSA) and visiting associate professor of physics at the University of Illinois, Urbana, IL 61801, USA.
3. S. L. Shapiro and S. A. Teukolsky are professors of astronomy and physics at Cornell University, Ithaca, NY 14853, USA.
4. L. Smarr is director of NCSA and professor of astronomy and physics at the University of Illinois, Urbana, IL 61801, USA.
5. W.-M. Suen is associate professor of physics at Washington University, St. Louis, MO 63130, USA.
6. J. Winicour is professor of physics and astronomy at the University of Pittsburgh, Pittsburgh, PA 15260, USA.