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About the Editors D O N A L D W. P F A F F heads the Laboratory of Neurobiology and Behavior at The Rockefeller Uni- versity. He received his scientific training at Harvard University and MIT and is a member of the Na- tional Academy of Science and a Fellow of the Amer- ican Academy of Arts and Sciences. Pfaff's labora- tory focuses on steroid hormones and brain function, interactions among transcription factors, luteinizing- hormone-releasing-hormone neurons, and genes influ- encing neuronal functions. He is the author or coau- thor of over 10 books and more than 600 research publications. ARTHUR P. ARNOLD, professor of physiological sci- ence at UCLA, was educated at Grinnell College and The Rockefeller University. He has been named a Fel- low of the John Simon Guggenheim Foundation and of the American Association for the Advancement of Science, and was the inaugural president of the Society for Behavioral Neuroendocrinology. Arnold's laboratory studies sexual differentiation of the brain and the effects of steroid hormones on neurons. Recently, the focus of his research has been on the role of the sex chromo- somes in brain development. Much of his work has been on two neural systems that are sensitive to go- nadal steroidsmthe neural circuit for song in Passerine birds and the spinal nucleus of the bulbocavernosus. ANNE M. ETGEN is professor in the Departments of Neuroscience and Psychiatry at the Albert Einstein Col- lege of Medicine. She received her scientific training at the University of California, Irvine, and Columbia University. She is a two-time recipient of Research Sci- entist Development Awards and MERIT Awards from NIMH. Etgen served as director of the Sue Golding Graduate Division on Biomedical Sciences at the Al- bert Einstein College of Medicine (1997-2000) and has been on the External Advisory Committee for the Mi- nority Fellowship Program in the Neurosciences since 1999. Her laboratory focuses on the mechanisms un- derlying ovarian steroid hormone regulation of female reproductive physiology and behavior, with a particu- lar emphasis on the hormonal regulation of neurotrans- mission. She is the author or coauthor of approximately 100 research publications. SUSAN E. FAHRBACH is professor in the Department of Entomology and a member of the Neuroscience Pro- gram at the University of Illinois at Urbana-Champaign. She was named University Scholar and is the direc- tor of the Howard Hughes Program for Undergraduate Education in the Life Sciences at Illinois. She has re- ceived numerous awards for teaching, including being named an Illinois Vice-Chancellor's Teaching Fellow, and is a mentor in the College of Liberal Arts and Sci- ences Teaching Academy. She was introduced to the study of the mechanisms of behavior as an undergrad- uate at the University of Pennsylvania. She then stud- ied physiology at Oxford University with the goal of becoming a physiological psychologist. Her studies of the endocrine mediation of maternal behavior in ro- dents as a graduate student at The Rockefeller Univer- sity led to her current broad interests in the hormonal regulation of behavior, while postdoctoral work at the xxxix xl About the Editors University of Washington stimulated an interest in in- sect models. ROBERT T. RUBIN, M.D., Ph.D., is Highmark Blue Cross Blue Shield Professor of Neurosciences and professor of psychiatry at the MCP Hahnemann University School of Medicine, Allegheny General Hospital, Pittsburgh, Pennsylvania. Prior to joining Allegheny General Hospital in 1992, he was professor of psychiatry and biobehavioral sciences at the UCLA School of Medicine. He is certified in psychiatry by the American Board of Psychiatry and Neurology, and he has a Ph.D. in physiology. For more than 30 years, his research has focused on the neuroendocrinology of stress and depression. Currently, he is studying the in- fluence of ace@choline neurotransmission in the brain on the activity of the hypothalamic-pituitary-adrenal cortical axis. Rubin also has a clinical practice in adult psychiatry, specializing in the treatment of bipolar dis- ease, depressive disorders, and anxiety disorders.