Claus Jacob is a German scientist functioning as the Head of Bioorganic Chemistry, at the School of Pharmacy, Saarland University. He received his B.Sc.(Hons) 1st class in Chemistry in 1993 from the University of Leicester, England, and his DPhil (Oxon) from the University of Oxford in 1997 under the supervision of Allen Hill. His interests in philosophy, history and psychology led to a Magister Artium (MA) degree from the University of Hagen in 1998. He has been a postdoctoral researcher at Harvard Medical School with Bert Vallee and a (senior) lecturer at the University of Exeter before returning to the Saarland in 2005. Claus is an expert in a variety of topics ranging from organic synthesis, bioorganic chemistry, catalytic sensor/effector agents, intracellular diagnostics, nanotechnology, natural products, reactive sulfur and selenium species, and redox regulation via the cellular thiolstat to philosophical, social aspects and environmental aspects of science. He has contributed more than 200 publications in the previously mentioned fields. He is Editor-in-Chief of Sci and two other journals in the fields of sustainable chemistry and nutrition, and is politically active on an ecological democratic platform.