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Michael L. Gross, Professor of Chemistry, Medicine, and Immunology at Washington University, St. Louis, was among 396 members elected as a 2017 Fellow of the American Association for the Advancement of Science (AAAS), the world’s largest general scientific society. Election as AAAS fellow honors members whose contributions to science and technology, scientific leadership and extraordinary achievements across disciplines have distinguished them among their peers and colleagues. Prof. Gross was recognized for his distinguished contributions to physical-organic, analytical, environmental and biophysical chemistry by developing and applying mass spectrometry methods. The new AAAS Fellows will be recognized on Feb. 17, 2018 during the Fellows Forum at the 2018 AAAS Annual Meeting in Austin, Texas. Gross, who has worked in the field of mass spectrometry for nearly 50 years, has authored/co-authored more than 600 publications in mass spectrometry and received numerous awards, including the American Chemical Society (ACS) Field and Franklin medal for excellence in mass spectrometry in 1999, the ACS Midwest Award in 2002, the Thomson Medal from the International Mass Spectrometry Foundation in 2006, and, most recently, the 2018 ACS Award in Analytical Chemistry. He was founding Editor-in-Chief of our journal for 26 years from 1990-2015. He began his career at the University of Nebraska-Lincoln, where he was distinguished Professor of Chemistry and Director of a National Science Foundation Center for Mass Spectrometry. In 1994, he joined the faculty at Washington University, where he is Director of the National Institutes of Health (NIH) Biomedical Mass Spectrometry Research Resource. Gross’ current research focuses mainly on the development of mass spectrometry in biophysics and structural biology, specifically to probe protein-ligand interaction interfaces, affinities and folding/unfolding. This work includes both instrument and method development and application to important proteins and protein complexes. He graduated with a B.A. cum laude in chemistry from St. John’s University and earned his doctorate in organic chemistry from the University of Minnesota. He completed one year each of postdoctoral research at the University of Pennsylvania (Ed Thornton) and at Purdue University (Fred W. McLafferty).