Zheng Ouyang is an assistant professor of biomedical engineering at Purdue University who is interested in MS instrumentation and its application in chemical and biomedical analysis. Robert J. Noll is the managing director of the Center for Analytical Instrumentation Development and a research scientist in the Aston Laboratory for Mass Spectrometry at Purdue. His research interests include physical chemistry, MS, chemometrics, miniature instrumentation, and the Orbitrap analyzer. R. Graham Cooks is a professor at Purdue and is interested in all aspects of MS, from ion motion to ion chemistry, in small instruments and large, and in applications across the sciences. Address correspondence about this article to Cooks at Purdue University, Chemistry Department, 560 Oval Dr., West Lafayette, IN 47907.