Kent M. Van De Graaff(Provo, UT) is currently a professor of zoology at Weber State University in Ogden, Utah. He received his B.S. in Zoology at Weber State College, his M.S. at the University of Utah, and his Ph.D. at Northern Arizona University. He completed a postdoctorate course in neuromyology, and taught anatomy at the University of Minnesota and Brigham Young University. Van De Graaff is the author or coauthor of several college textbooks, includingHuman Anatomy,Concepts of Human Anatomy and Physiology, andSynopsis of Human Anatomy and Physiology. R. Ward Rhees(Orem, UT) is a professor of zoology at Brigham Young University. He received his B.S. in Pharmacy at the University of Utah and his Ph.D. in Physiology at Colorado State University. He taught at Weber State College and has been a visiting professor in the department of anatomy and the Brain Research Institute at the UCLA School of Medicine. His research on sexual differentiation of the brain has been published in numerous leading scholarly journals and presented at national and international conferences. Sidney Palmer(Rexburg, ID) currently teaches at Brigham Young University - Idaho.