Stachl is an Associate Professor of Behavioral Science and Director at the Institute of Behavioral Science and Technology (IBT) at the University of St. Gallen, Switzerland who specializes in research methodology (i.e., machine learning), naturalistic behavior, and personality. In his research he uses digital records from consumer electronics and machine learning to draw inferences about psychological traits and behavior. Currently, he works on new formats to quantify and analyze large amounts of sequential behavioral data from mobile sensing studies. In addition to empirical work, he is interested in topics of interpretable AI and promotes open science practices. At the IBT, he teaches courses on mobile sensing, behavioral metrics, digital footprint, and AI psychometrics.