He received his Ph.D. from the University of Stuttgart in 2016. Since the start of his Ph.D. in 2012, he worked on several different national and international research projects and published at the major venues in human-computer interaction. Stefan holds a B.Sc. and M.Sc. from the University of Duisburg-Essen. During his studies, he worked as student assistant at the Pervasive Computing and User Interface Engineering group and for the DFKI Saarbrucken. His current research interest is in the area of human-computer interaction, in particular mobile, wearable, and ubiquitous interaction.