Dr. Stephan Petersen graduated in Materials Science at the RWTH Aachen in 1989. He subsequently joined the institute of Solid State Physics at Research Centre, Jülich, where he worked on high pressure solution growth and defect thermochemistry of gallium-arsenide. This formed the basis for his Ph.D. degree, which he received in 1994. He joined GTT-Technologies in 1992.

Dr. Sabrine Khadhraoui graduated in Metallurgy from the Institute of Metals Technologies at the University of Duisburg-Essen (Germany) in 2011. She joined the R&D Division of the company SMS group afterward, which is a supplier of plants and technologies for processing steel and non-ferrous metals. Her main field of expertise is the modeling and simulation of various metallurgical processes, with a special focus on the thermodynamics and kinetics of metal-slag-gas reactions.

Alejandro studied a bachelor's degree in mechanical engineering and a master's degree in renewable energies and energy efficiency at the University of Zaragoza, in Spain. Then, he completed his PhD in resource efficiency evaluation of metallurgical processes at the TU Bergakademie Freiberg and the Helmholtz Institute Freiberg, in Germany. Since 2022, Alejandro is working as process engineer at Glencore Nordenham.