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Company Overview
The ISA Group was founded in 1978 by Dr. Royer F. Cook, who continues as the President of ISA and a Senior Research Scientist. During the past 25 years, ISA has specialized in the application of behavioral science research to issues of health and public safety, and has conducted scores of R&D projects for the major federal research agencies, leading foundations and corporations.

In the health arena, our work has focused especially on the development and testing of effective health promotion approaches, and on ways to prevent substance abuse in both adolescents and adults. Many of these projects have been testing innovative ways of integrating substance abuse prevention into workplace health promotion.

Increasingly, we are combining sophisticated methods of behavior change with cutting-edge information technologies, using video, CD-ROM and Internet-based techniques to present information in ways that maximize the likelihood of effective and lasting improvements in health practices.

Through our non-profit arm, the Institute for Social Analysis, we continue research on social policy and justice, exploring ways to improve the performance of the justice system and make it more responsive to the needs of citizens and communities.

Principal Staff
Royer F. Cook, Ph.D.
Dr. Cook has over thirty years of senior experience in the design and direction of applied, evaluation research and the development and field test of multimedia health promotion and disease prevention programs. His experience also includes multi-site program evaluation in the areas of public health, substance abuse prevention, and criminal justice and the development of assessment methods and instruments. Dr. Cook has provided research and consulting services to major federal agencies and Fortune 500 companies.
Vice President
Rebekah K. Hersch, Ph.D.
Dr. Hersch has been a senior member of the ISA staff for over seventeen years with particular expertise in program evaluation and applied research in health, substance abuse prevention, and criminal justice. Dr. Hersch has extensive experience in quantitative and qualitative research methods for research in the community, schools, and the workplace.
Senior Research Scientist
Diane K. Deitz, Ph.D.
Dr. Deitz is a health psychologist with over twenty years of research experience in substance abuse prevention, cardiovascular health, and worksite stress. Dr. Deitz's current research focuses on substance abuse prevention, health promotion, and workplace managed care.
Research Scientist
Douglas W. Billings, Ph.D.
Dr. Billings joined ISA in 2003. Dr. Billings is a clinical psychologist specializing in the application of cognitive-behavioral models of stress and coping to a variety of health topics including HIV/AIDS and health promotion. He has expertise in the measurement and design of longitudinal studies of change.
Senior Research Associate
Samantha Leaf, Ph.D.
Dr. Leaf joined ISA in 2008. Dr. Leaf is a social psychologist who studies health beliefs and behavior change. Her research interests include cancer prevention and screening, adjustment to cancer diagnosis, and psychosocial and behavioral aspects of genetic testing.