The Emeritus Group at MPI-Marburg is headed by renowned biochemist and Gottfried Wilhelm Leibniz Prize recipient, Rudolf K. Thauer, who was also the founding director of the institute when it was established in 1991. The scientific focus of the group is on the biochemistry of methanogenic archaea, methanotrophic archaea and saccharolytic clostridia. The following specific topics are being addressed:
* Hydrogen activation
* Methane formation and anaerobic methane oxidation
* Ferredoxin reduction