Dr. Paul Marx was a Professor of Marketing at the University of Siegen, where he conducted research particularly on e-commerce, preference measurement, new media, big data, and recommender systems. He studied aero- and hydrodynamics as well as management at Novosibirsk State Technical University (Russia) and subsequently held senior positions in marketing. In 2000 he moved to Germany, deepened his studies in economics at the University of Hannover, and founded the online service for online surveys eQuestionnaire — today QUESTIONSTAR. Paul earned his doctorate at the Bauhaus University of Weimar and published his research in leading international journals, including the Journal of Marketing.