R.J. Wirth is Chief Executive Officer, co-Founder, and a managing partner at VPG. Dr. Wirth received his PhD in quantitative psychology / psychometrics from the historic LL Thurstone Psychometric Laboratory at University of North Carolina – Chapel Hill. For nearly two decades, Dr. Wirth has collaborated widely within the pharmaceutical and medical device industries to develop/evaluate/implement clinical outcome assessments. Dr. Wirth has authored numerous peer-reviewed publications on such topics as item factor analysis, structural equation modeling, validity, as well as various aspects of scale development. He has participated as an invited expert on multiple regulatory panels and industry advisory boards focused on PRO/COA development.