The research at the Power Electronic Systems Laboratory (PES) opened up new fields of applications and drove the innovation of power electronics and mechatronic systems in close partnership with both Swiss and international industry. In line with the focus areas of ETH Zurich, fundamentally new concepts, e.g., for sustainable energy systems, sustainable mobility, future datacenters, and medical applications, were of primary interest, along with general scientific challenges and the pursuit of excellence and an internationally leading reputation.