Dr. Klein is an Associate Professor of Biobehavioral Health at Penn State University and Director of the Penn State Behavioral Neuroimmunomodulation Laboratory (BNIL). Her research focuses on the biobehavioral effects of stress on addictive behaviors including cigarette smoking and opioid abuse. Dr. Klein earned a M.S. (1995) and Ph.D. (1997) in Medical Psychology from the Uniformed Services University of the Health Sciences in Bethesda, MD. She went on to complete a National Institute of Mental Health post-doctoral fellowship in Health Psychology at UCLA (1999) before joining the Penn State faculty in 1999. Dr. Klein examines human and animal subjects in laboratory settings using a multidisciplinary approach that incorporates neuroendocrine, immunological, behavioral (e.g., drug use, eating), and psychological variables to evaluate sex differences biobehavioral responses to stress. Her research is funded by the National Institute of Child Health and Development (NICHD), the Office of Naval Research, and the National Institute on Drug Abuse (NIDA).