Erwin Baur attended the Technical University of Aachen, Germany where he studied Mechanical Engineering, specializing in Plastics Technology. He was previously a member of scientific staff (1984-1989) at the "Institut für Kunststoffverarbeitung" (IKV) in Aachen. He is currently founder and Managing Director of M-Base Engineering + Software GmbH: a leading international supplier of material databases, systems and software. Katja Ruhrberg is Material Data Manager at M-Base Engineering + Software GmbH in Aachen, Germany. She received her degree in Civil Engineering from the Technical University of Aachen and later spent six years as a Member of the Public Relation Staff at an institute of the RWTH (heinisch-Westfälische Technische Hochschule) Aachen. William Woishnis launched the first version of 'Chemical Resistance' in 1989, and went on to co-found William Andrew Publishing the following year. He later co-founded Knovel, offering a ground-breaking combination of online books and data, providing engineers with a productivity platform that is still widely used today. He passed away on August 2, 2009.