Dr. Geoffrey E. Dahl is the Harriet B. Weeks Professor in the Department of Animal Sciences at the University of Florida. Dr. Dahl conducts applied and basic research with direct impact on animal production and health. His program focuses on understanding the physiological impact of management interventions, particularly heat stress abatement and photoperiod manipulation, at various stages of the lactation cycle, and using that knowledge to optimize cow health and performance. Fundamental aspects of Geoff’s work have led to application in sheep, goats and pigs. His career provides an excellent example of how animal science research can be performed to develop an understanding of biological processes that deepens our knowledge of animal function while leading to practical advances that improve the efficiency of production.