Lars Kaczmirek is vice scientific director and heads a team which develops and conducts population studies at the department Monitoring Society and Social Change at GESIS – Leibniz Institute for the Social Sciences in Germany. He is also adjunct assistant research scientist at the Center for Political Studies (CPS), Institute for Social Research (ISR), University of Michigan. Lars studied psychology with minors in neurology and computer science and holds a PhD in psychology from the University of Mannheim. He is co-founder and co-editor of the journal ‘Survey Methods: Insights from the Field’ and has served on the board of the German Society for Online Research (DGOF) both as executive, treasurer and program chair for many years. He is passionate about reducing survey error and has published on various topics in survey research such as questionnaire design, mixed-mode, eyetracking, survey software tools, human–survey interaction, and social media research.