Richard C. Brusca is Executive Director, Emeritus of the Arizona-Sonora Desert Museum and a Research Scientist at the University of Arizona. Rick is the author of nearly 200 research publications and 13 books, including the popular field guides Common Intertidal Invertebrates of the Gulf of California, A Seashore Guide to the Northern Gulf of California, and A Natural History the Santa Catalina Mountains, with an Introduction to the Madrean Sky Islands. He has been the recipient of more than 100 research grants from the National Science Foundation, NOAA, the National Geographic Society, the David and Lucile Packard Foundation, and many other agencies and foundations. He has served on panels for the National Science Board, National Science Foundation, Smithsonian Institution, PEW Program in Conservation and the Environment, Public Broadcasting Service, IUCN Species Survival Commission, and many others. Wendy Moore is Assistant Professor in the Department of Entomology at the University of Arizona and Curator of the University of Arizona Insect Collection. Her degrees were earned at Vanderbilt University (B.S., General Biology), the College of Charleston (M.S., Marine Biology), and the University of Arizona (Ph.D., Entomology/Ecology and Evolutionary Biology). Dr. Moore's long-term research interest is the evolution of biotic diversity-especially the evolution of symbiotic lifestyles and how major biotic, climatic, and tectonic events may have influenced the timing and patterns of diversification. Much of her current research is on the carabid beetle subfamily Paussinae, many species of which are obligate symbionts with ants. She is also deeply committed to collections care and enhancement, and the use of bioinformatics to make collections-based data widely available to diverse user communities. Stephen M. Shuster is Professor of Invertebrate Zoology and Curator of Marine Invertebrates and Molluscs at Northern Arizona University. He earned a B.S. in Zoology from the University of Michigan, an M.S. in Biology from the University of New Mexico, and a Ph.D. in Zoology from the University of California, Berkeley. The author or coauthor of over seventy-five journal articles, encyclopedia entries, book reviews, and contributed book chapters, Dr. Shuster collaborated with Michael J. Wade on the book Mating Systems and Strategies (2003). His research broadly concerns mating system evolution, male and female reproductive behavior, community and ecosystem genetics, and the population biology of marine organisms. His recent work focuses on the measurement of selection within and among species, and the maintenance of genetic variation in natural populations of marine crustaceans and terrestrial arthropods.