Jan is a psychometrician, statistician and methodologist. He serves as a psychometric and statistical advisor for ARC EoE. He aims to improve measurement procedures and scales of mental health conditions. Jan has expertise in latent variable models such as structural equation modelling, item response theory modelling, and latent class modelling. Recently, he gained interest in networks models and developed computerized adaptive testing platforms. Besides research, he serves as a professor at Charles University in Prague where he teaches statistics, psychometrics and methodology.