Dan Cowles is the Gas Lab Manager at Air Liquide Balazs NanoAnalysis, located in Dallas, TX.  Dan received a Ph.D. in Physical Chemistry from the University of Colorado-Boulder, and a B.A. in Chemistry from the University of Oregon.  Dan has been with Air Liquide for 25 years, including 3 years in Air Liquide’s Tsukuba, Japan R&D Center.  His work has focused on reactive gas sampling and analysis, trace contaminant quantitation in gases and chemicals, and process tool exhaust characterization.