Loes Janssen is a postdoctoral researcher in the Amsterdam School of Communication Research (ASCoR) at the University of Amsterdam. Her research focuses on adolescents' well-being, parent-adolescent interaction, and the effects of social media on well-being of adolescents. In her work, she employs intensive longitudinal data (EMA/ESM) to capture the daily life experiences of adolescents. 

Janssen is involved in Project AWeSome, an interdisciplinary collaboration that investigates the effects of social media use on various aspects of adolescents' well-being. Janssen is affiliated with the Center for research on Children, Adolescents, and the Media (CcaM). Prior to joining the University of Amsterdam, she completed her PhD 'Changes in perspective: Parenting and well-being of adolescents in daily life' in 2022 at Leiden University (department Clinical Psychology) under supervision of prof.dr. Bernet Elzing and dr. Bart Verkuil.