On our home page you will find a short description of our research and a list of selected papers. We are interested in the Biological Physics of Cellular Systems and Soft Matter. In vivo studies of animal cells and slime molds are combined with in vitro investigations of model membrane systems. As a general framework, we use phases and phase transitions observed in these (active) biological systems. In particular, we want to understand active membrane waves in fibroblast cells, morphology and structure formation in slime molds, as well as thermal fluctuations of lipid membranes. We employ and develop advanced light microscopy. Image time sequences are analyzed using concepts from condensed matter physics and graph theory. You might find a short glossary of terms and concepts useful.