Jan E. Szulejko received the B.Sc. degree from the University of Wales, Cardiff, U.K., in physics (cum laude, 1974) and chemistry ( cum laude, 1977). In 1981, he received the Ph.D. degree in negative ion mass spectrometry from the University of Wales. From 1982 to 1998, he studied various aspects of ion-molecule reactions and ion thermochemistry. He is a co-author of a 1993 seminal paper on the proton affinity scale (J. Am. Chem. Soc., vol. 115, pp. 7839–7848, 300 citations). He has modified and built a number of mass spectrometers since 1984. In January 2001, he first joined the research group of Prof. T. Solouki at the University of Maine, Orono, to work on the interfacing of a gas chromatograph (GC) to an FT-ICR MS (GC/FT-ICR MS) for environmental and breath analysis. His former position at the University of Maine as Research Scientist is to evaluate the efficacy of breath analysis for cancer diagnosis. He was at the Department of Environment and Energy, Sejong University, Seoul, S Korea July 2012 to February 2014. He is currently at Hanyang University, S Korea since March 2014.