Steffen Sirries studied business administration at the RWTH Aachen University with a focus on business taxation and auditing, corporate strategies in competition (microeconomics) as well as energy and process engineering. During his PhD he was employed as a research associate at the Department of Economics, in particular Empirical Economic Research at the RWTH Aachen University and at the University of Bayreuth. He taught several consecutive courses on empirical methods in economics. His dissertation consists of essays on international trade and migration research with a quantitative focus. After obtaining his doctorate in economics at the University of Bayreuth, he joined the Institute for Employment Research (IAB) in Nuremberg as a scientific adviser to politics and the public. He also gained extensive independent teaching experience as an external lecturer with a specialization on quantitative and empirical methods at the Frankfurt School of Finance & Management, the Fern Universität in Hagen, and within the accredited master's programs at the Haus der Technik e.V. Dr. Steffen Sirries joined the team of Lademann & Associates GmbH in the summer of 2019 as Senior Economist. As a Manager at Lademann & Associates he now focusses as a scientific advisory and consulting wrt. competition economics in general and antitrust and cartel trials. In addition to his extensive methodological knowledge, he gained a profound experience in the fields of international trade, the automotive industry, platform economics and digital markets as well as antitrust discounts agreements and the abusive exploitation of dominant positions.