Christian Mester was awarded a PhD by the University of Bonn, Germany, for his work at CERN, the European Organization for Nuclear Research, in Geneva, Switzerland, in 2009. In 2011, he joined the Electrical Power and Energy laboratory at the Federal Institute of Metrology METAS in Berne, Switzerland. His current research activities include the calibration of conventional and non-conventional instrument transformers, power standards, power quality instruments and PMUs, as well as sampling procedures and algorithms.