Christopher B. Ruff is a professor and director of the Center for Functional Anatomy and Evolution@the Johns Hopkins University School of Medicine in Baltimore, Maryland. He received his Ph.D. in biological anthropology@the University of Pennsylvania in 1981 and carried out postdoctoral work in the Orthopaedic Biomechanics Laboratory@Beth Israel Hospital and Harvard Medical School. Ruff joined the faculty of Johns Hopkins in 1983. His major research interest is the relation between mechanical forces and bone structure in living and fossil animals. Most recently he has been studying the effects of changes in subsistence strategy on skeletal form in Holocene Europe and Western Asia. Address: Center for Functional Anatomy and Evolution, Johns Hopkins University School of Medicine, 1830 E. Monument Street, Baltimore, MD 21205. Internet: cbruff@jhmi.edu