Silke Leimkühler, PhD, is a Full Professor in Molecular Enzymology at the University of Potsdam in Germany. Her research is focused on molybdenum cofactor biosynthesis, molybdoenzyme enzymology, cellular sulfur transfer mechanisms for sulfur-containing biomolecule synthesis, and related subjects. Günter Schwarz is Professor for Biochemistry at the University of Cologne. His research is focused on molecular biology, protein biochemistry, enzymology, structural biology, cell biology, and more. Oliver Lenz is the Head of the Research Group Biochemistry of Gas-Converting Biocatalysts at the Technische Universität Berlin. His research is focused on the role of molecular hydrogen in the metabolism of microorganisms. Oliver Einsle is a Full Professor of Biochemistry in Freiburg, Germany and the Director of the Institute of Biochemistry in the Faculty of Chemistry and Pharmacy. His research is focused on the structural and functional characterization of metalloproteins, like nitrogenase and nitrous oxide reductase.