Associate Director for Scientific ProgramsYerkes National Primate Research CenterDivision ChiefNeuropharmacology and Neurologic Diseases, YerkesDirectorYerkes Imaging CenterPhone: 404-727-7786Fax: 404-727-1266Email: lhowell@emory.eduLab Web Site:http://imaging.yerkes.emory.edu/BiographyLeonard Howell, PhD, is an expert in nonhuman primate models of drug addiction.