Prof. Leslie Pendrill has been the Head of Research of the Measurement Division at the SP Technical Research Institute of Sweden since 1985. His research work is concerned with fundamental metrology, in particular optoelectronic, laser, length, and mass measurements, while his applied metrology activities include optimized measurement uncertainty studies and the measurement of perception. He is actively involved in several internationalmetrology activities, holding leading roles such as currently the 2009–2012 Chair of the European Association of NationalMetrology Institutes (EURAMET) and earlier as Chair (2006–2008) of the International Union of Pure and Applied Physics (IUPAP) Commission on Symbols, Units, Nomenclature, Atomic Masses and Fundamental Constants (SUNAMCO). He has just become a member of the NCSLI Board as EURAMET Representative.