The late Michael H. Ross, Ph.D. was Professor and Chairman Emeritus of the Department of Anatomy and Cell Biology at the University of Florida College of Medicine, Gainesville, Florida. For almost half a century, Dr. Ross contributed to histology education not only as an author of a popular histology textbook, but an equally recognized atlas. He was also a passionate teacher and mentor of several generations of medical students, fellows, and junior faculty. His research interest was in the male reproductive system, where he pioneered studies on the blood-testicular barrier and the role of the Sertoli cell in maintaining the barrier. Upon his retirement, Dr. Ross devoted his time to new editions of his histology textbook and to bringing to fruition this color Atlas of Descriptive Histology designed for today's student.; Wojciech Pawlina, M.D. is Professor and Chair of the Department of Anatomy at the Mayo Clinic College of Medicine in Rochester, Minnesota. He serves as the Assistant Dean for Curriculum Development and Innovation at Mayo Medical School and as the Medical Director of Procedural Skills Laboratory. Dr. Pawlina teaches gross anatomy, embryology, and histology to medical students, residents, fellows, and other health care professionals. His research interest in medical education is directed towards strategies to implement professionalism, leadership, and teamwork curriculum in early medical education. He is also Editor-in-Chief of the journal Anatomical Sciences Education.; Todd A. Barnash is the Computer Support Specialist for the Department of Anatomy and Cell Biology at the University of Florida in Gainesville, Florida. Since 1993 he has been the primary information technology, information security, and digital imaging resource for the department and has collaborated with Michael H. Ross, Ph.D. as well as other faculty on numerous projects throughout his tenure at the University.