Friedrich Siebert is Professor for Biophysics at the University of Freiburg. He studied physics in Freiburg and Hamburg, receiving his PhD in solid-state physics. Since his diploma thesis he is working with different methods of vibrational spectroscopy. In 1972 he changed to biophysics, establishing the method of static and time-resolved infrared difference spectroscopy. Current research interests are photo-biological systems, membrane proteins and receptors, surface-enhanced techniques, time-resolved IR techniques.

Peter Hildebrandt received his PhD in chemistry from the Universität Göttingen in 1985. After a post-doc stay in Princeton, he worked in research institutes in Göttingen, Mülheim, and Lisboa. Since 2003 he is Professor for Physical Chemistry and Biophysical Chemistry at the Technische Universität Berlin. His research is dedicated to vibrational spectroscopy of biological systems, focussing on Raman spectroscopic techniques applied to redox proteins and photoreceptors.