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Eric Johnson, PhD, is a senior research scientist with over 10 years' experience in the epidemiologic and behavioral genetic study of substance use and mental health. Before joining RTI in January 2005, he was an associate scientist at the Henry Ford Health Sciences Center and associate professor of psychiatry at the Wayne State University School of Medicine. He is currently the principal investigator for the Epidemiology of Insomnia and Mental Illness in Adolescence project and co-investigator for the Collaborative Study of the Genetics of Nicotine Dependence project. His experience and interest include substance use, psychiatric, and sleep disorder epidemiology; the interaction of environmental and genetic influences on these disorders; and the application of epidemiology to intervention/prevention programs. Dr. Johnson was the lead analyst and writer for the National Sleep Foundation's Sleep in America surveys and is the author of numerous articles on substance use, mental illness, and sleep disorders. | 