Since November 2018, Vasileios has been leading the Scientific Computing Support Group after working for three years as an HPC Application Specialist in the same group. As group lead, Vasileios manages the activities of the team to enable the CSCS user community to make the best use of the HPC environment that CSCS is providing. Vasileios specializes in performance engineering and regression testing. He has mentored teams in GPU Hackathons organized by the center and acted as the lead developer of a framework for regression testing and continuous integration of HPC applications. Furthermore, he is involved in directive-based GPU programming, representing the center in the OpenACC technical committee. Vasileios received a Ph.D. in high performance computing from the National Technical University of Athens.