Memphys is an international and interdisciplinary research network concerned with parallel experimental, theoretical, and simulational research within the broad fields of physics, molecular biophysics, and physical chemistry of macromolecules, soft interfaces, and biological membranes and the interaction of these systems with foreign molecules like drugs. The focus is on developing molecular descriptions of the physical and physico-chemical properties of lipid-membrane systems and investigating how these properties control membrane function. Results of the fundamental research are applied within drug delivery, biotechnology, and food science.