Prof. Dr. Spiros A. Pergantis received a B.Sc. in chemistry from the University of Ioannina, Greece, and a PhD in chemistry from the University of British of Columbia, Canada, in 1994. He was then awarded a United States National Research Council Resident Research Associateship Award for a two-year research period with the US Environmental Protection Agency. Subsequently, he returned to Europe as a postdoctoral fellow, first at Utrecht University and then at the Free University, the Netherlands. His first academic position was a lectureship in analytical chemistry, at Birkbeck College, University of London, where he spent a five-year period. In 2003, he joined the Department of Chemistry, University of Crete, Greece, where he is currently a professor of Analytical Chemistry. His research interests include the development of advanced molecular mass spectrometric methods for elemental speciation analysis in environmental and biological systems. This includes the detection and characterization of unknown compounds, especially those found in environmental matrices. His research in atomic mass spectrometry has led to the development of approaches for the determination of metal-containing nanoparticles, as well as the metal content of individual biological cells. These methods are based on single-particle and single-cell ICP-MS used in combination with separation approaches such as ion mobility, hydrodynamic liquid chromatography, and chip-based microfluidics.