Experience Matters

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DxR Clinician used on Table

Before most people had even heard of the Internet, a team of medical educators at Southern Illinois University had the progressive idea to use computers to simulate the patient encounter. SIU School of Medicine faculty including Howard Barrows, M.D., Kevin Dorsey, M.D., Ph.D., and Hurley Myers, Ph.D., pioneered curriculum design for problem-based learning and patient simulations, and they helped to develop what are now core principles for building and measuring clinical expertise. Drs. Myers and Dorsey teamed up with software engineer Eldon Benz to produce the world’s first virtual patient software, called Diagnostic Reasoning (DxR). This has since evolved into the comprehensive suite of patient simulations known as DxR Clinician.

Building on this initial success, DxR Development Group has since authored an impressive diversity of medical education products, including interactive courseware in anatomy, physiology, and clinical medicine. In order to put our educational concepts into practice we developed DxR CORE, a versatile learning management system for the design and delivery of secure online teaching and testing.

DxR is innovative, nimble, and ready to develop the next bright idea in educational technology.


Dr. J. Hurley Myers, Ph.D., is Emeritus Professor of Physiology and Internal Medicine, past Assistant Dean for Medical Education, and past Chair of the Department of Physiology and Pharmacology at Southern Illinois University School of Medicine. Dr. Myers is also past President of the Illinois Affiliate of the American Heart Association.  Dr. Myers is co-founder of DxR Development Group and President and CEO.

Eldon Benz is a software engineer and co-founder of DxR Development Group. He is the creator of DxR Clinician and its derivatives and continues to oversee their ongoing development, in addition to conducting new projects in medical education and assessment of clinical skills.