Skip to main content


home button

About the Institute


The purpose and mission of the Institute is to provide a public service to USU students and to larger communities and social units through the broadest outreach of education, training, and research applying the I-System Model and I-System Interventions. The Institute provides annual support for education, training, research and applications of the I-System Model and certifications of MBB® (Mind-Body Bridging) and other I-System Interventions. It also supports expansion and continued research by offering an integrated and wide-variety of stand-alone programs, encouraging participation by and integration with other disciplines, and creates a magnet for innovation and integrative approaches to healing collective strife. 

The I-System Model, which provides the foundation for both Mind-Body Bridging® and Productive Mind, was developed by Stanley H. Block, MD, together with his wife, Carolyn Bryant Block in the late 1990s to optimize heath, wellness, and human performance.


Institute Staff

Derrik Tollefson, MSW, PHD, Director

Derrik T

 Tollefson is Professor of Social Work and head of the Department of Sociology, Social Work and Anthropology at Utah State University (USU). He also directs the I-System Institute for Transdisciplinary Studies at USU. He was the founding coordinator of USU’s Master of Social Work program from 2007-2016. He has conducted a number of evaluations of human services programs including those providing Mind-Body Bridging®, domestic violence, child welfare, and mental health interventions. He has served as PI on a number of state and federal-funded grants and contracts, is the author of a number of journal articles and book chapters and has presented at numerous national and international conferences on his research and pedagogy. He serves as past president of the Utah Association for Domestic Violence Treatment, an organization which he co-founded, and co-chair of the Utah Domestic Violence Offender Management Task Force’s Treatment Standards Committee. He’s also served on a number of other human services organization governing and advisory boards. He teaches graduate and undergraduate social work courses and holds a clinical social work license from the State of Utah. He received a bachelor’s degree in social work and sociology from Utah State University, a master’s degree in social work from the University of Denver, and a Ph.D. in social work from the University of Utah.


Kevin Webb, MSW, LCSW, Associate Director


 Webb is a clinical social worker with over 30 years experience in the fields of disabilities, behavioral and mental health, domestic violence, trauma, addiction and substance abuse, and child welfare, with over 25 years as a clinical consultant and child and family therapist. Kevin holds a Bachelor of Science in Psychology from Brigham Young University and a Master of Social Work from the University of Utah, and is a certified Mind-Body Bridging® Therapist. He has trained clinicians worldwide in MBB, including the United States, Canada, Macau, England, Poland, Switzerland, South Africa, and Finland. Since 2007, Kevin has co-chaired the Board of Professional Standards for MBB Therapy training and certification.  As the Associate Director of the USU I-System Institute he is excited to help others learn about and master the I-System Model and MBB®!


Guy du Plessis, M.A., Research Consultant


Guy du Plessis 
has a Master’s degree in psychology from the University of South Africa and is a research consultant at the I-System Institute for Transdisciplinary Studies at Utah State University. He has worked in the mental health field for over 19 years as an addictions counselor, program & clinical director, program developer, trainer, academic and researcher. He is the author of "An Integral Guide to Recovery: Twelve Steps and Beyond", "An Integral Foundation for Addiction: Beyond the Biopsychosocial Model", and co-author of the "Mind-Body Workbook for Addiction: Effective Tools for Relapse Prevention and Recovery", and has published academic articles in the fields of addiction treatment and studies, theoretical psychology and philosophy.