Stuart Oehrle is a senior field chemist with 30 years of tenure at Waters. In addition, he is an adjunct instructor for 25+ years at Northern Kentucky University, teaching such classes as freshman chemistry lab and instrumental analysis lab. Stuart obtained his chemistry degree from Northern Kentucky University and did his graduate work at the University of Alabama-Huntsville and University of Cincinnati. Stuart’s primary area of focus is in the development and application of LC and LC-MS/MS. He has been involved in a wide variety of research projects including extensive work in the identification and analysis of toxins from cyanobacteria using LC and LC-MS/MS as well as the development of the Porapak RDX solid phase extraction cartridge for groundwater analysis of explosives, and the use of LC-MS/MS for the analysis of chemical warfare agents to name a few. He has published or presented over 80 papers during his tenure as well as been awarded several patents.