John H. Campbell, Editor, University of California, Los Angeles, received his undergraduate education at the California Institute of Technology and his Ph.D. from Harvard University. Following postdoctoral studies at the Institut Pasteur, Paris, and the Commonwealth Scientific and Industrial Research Organization (CSIRO) in Canberra, Australia, Dr. Cambell joined the faculty of the Department of Anatomy and Cell Biology of the School of Medicine at the University of California, Los Angeles in 1964. He has served as a visiting scientist in the Division of Plant Industry at CSIRO; as both a visiting professor in the Department of Genetics and a visiting scholar in the Research School of Biological Sciences at the Australian University; as a visiting professor in the Mathematical Institute at Oxford University, England; and as the Robert Wesson Scholar on Scientific Philosophy and Public Policy at the Hoover Institution of Stanford University. An evolutionary biologist concerned especially with theoretical genetics and the development of biological patterns, Professor Cambell also pursues research interests in philosophy of science and analyses of the nonlinear aspects of the natural world

J. William Schopf, Editor, University of California at Los AngelesA member of the Department of Earth and Space Science, the Molecular Biology Institute, and the Institute of Geophysics and Planetary Physics (IGPP) at the University of California, Los Angeles. At UCLA he has been honored as the Faculty Research Lecturer and is recipient of the Distinguished Teacher Award and of the Faculty Prize for Academic Excellence. Discoverer of the oldest fossil now known on Earth, he has pursued geological and biological field studies in Australia, India, China, Europe, South Africa, North America, and the former Soviet Union.