He received his master's and PhD degrees in physics from the Johannes Kepler University in 2008 and 2012, respectively. He then joined the Someya-Sekitani Lab for Organic Electronics at The University of Tokyo as postdoctoral researcher. Kaltenbrunner's current research interests include soft electronics and machines, photovoltaics, lightning and thin-film transistors, flexible and stretchable electronics, and electronic skin.