Dr. Murray is the Chair of the Division of Epidemiology in the School of Public Health at The Ohio State University. Since 1978, he has evaluated intervention programs designed to improve the public health. Since 1989, he has focused on the design and analysis of group-randomized trials. He collaborates with colleagues around the country on the design, implementation and evaluation of group-randomized trials. He also conducts research to develop and test methods for the analysis of data from group-randomized trials. Dr. Murray teaches courses on the design and analysis of group-randomize...