Authors of the IDA

Dr. DeMichele is a Senior Research Sociologist in RTI International’s Applied Justice Research Division. He is the Director of the Center for Courts and Corrections Research and has conducted criminal justice research for nearly 20 years with a focus on correctional population trends, community corrections, risk prediction, terrorism/extremism prevention, and program evaluation. He has conducted research for local, federal, and foundation partners to assess criminal justice reforms, judicial decision making, and disengagement from extremist organizations. His research has recently been published in Crime & Delinquency, American Sociological Review, and Criminology & Public Policy.

Dr. Lowe is the Program Director of Grants and Research with the American Probation and Parole Association. In this role, he oversees the staff who work on the association’s various grant-funded projects involving the provision of training, technical assistance, and research/evaluation to the community supervision field. Nathan also manages and directly contributes to such projects, as well as coordinates the production of APPA’s journal Perspectives. As a former practitioner, Nathan’s areas of interest primarily concentrate on efforts to improve community supervision practices. Notably, he is co-author and manager of the Impaired Driving Assessment, a screening tool to identify risk and needs for individuals who are convicted of an impaired-driving offense. He has extensive experience in conducting research with populations involved with the justice system using mixed-mode methodologies and various statistical techniques. Nathan’s work has been published in a variety of formats, including scholarly peer-reviewed journals, professional journals, and technical reports. He received his Ph.D. in Sociology from the University of Kentucky.

Dr. Wanberg is a licensed psychologist, director of the Center for Addictions Research and Evaluation (CARE) in, Arvada, Colorado, and a consultant and trainer with numerous criminal justice agencies. He has over 45 years of experience in private practice and institutional settings as a clinical psychologist with concentrations in general practice, substance abuse, and corrections. He has been doing research for over 45 years in the areas of criminal conduct and substance abuse focusing on multivariate studies identifying different patterns and dimensions of substance use and addictive behaviors in adolescent and adult clinical and offender populations. Out of this research, he and his associates have developed reliable and valid instruments measuring multiple problem dimensions and conditions related to substance use and abuse. Dr. Wanberg is author and coauthor of numerous research articles and 13 books addressing the treatment of juvenile and adult substance abusing offenders.

Dr. Timken is Director and Principal Research Scientist of the Center for Impaired Driving Research and Evaluation, Boulder, Colorado. He was formerly Research Scientist and Clinical Director at the Alcohol and Drug Abuse Division, Colorado Department of Human Services in Denver. He is recognized internationally for his work in the areas of diagnosis and treatment for substance abusing drivers, and has over 54 years’ experience in the field. He developed the assessment, education and treatment system for alcohol/drug related traffic offenders in Colorado and has published numerous technical manuals in the field. He has conducted research with DUI offenders and has been involved in the development of both screening and differential assessment instrumentation and procedures for other substance abusing populations. In addition to his research activities he had a number of years in clinical practice and continues to provide consultation in this area. He recently completed a five-year term on the Boulder Beverage Licensing Authority and served as both Chair and Vice-Chair during his tenure. Over the years he has received a number of awards and honors including the Dr. Robert Weltzer award for Outstanding Dedication to Traffic Safety.