As the Deputy Laboratory Chief for the Laboratory of Organic Analytical Chemistry, Mr. Fayo has responsibility and sole oversight for 8 distinct laboratory sections and 2 major programs: Environmental Monitoring/Public Health Testing and Proficiency Testing Validation and must oversee over 60 specialized EPA (or EPA derived) methodologies within all the laboratories under the LOAC umbrella. These methods cover potable and non-potable water compliance, monitoring and public health emergencies within municipalities and individual residences, monitoring for contaminants in air near areas where health hazards in the environment are increased (laundromats, chemical sites, areas recently damaged by fire, etc.), monitoring for emerging contaminants like per- and polyfluoroalkyl substances (PFAS) in drinking water monitoring for unknown toxic chemicals in foods and in the environment, and the analysis and monitoring for herbicides, pesticides and polychlorinated biphenyls (PCBs in drinking water. He is also the supervisor of the department’s Gas Chromatography/ Mass Spectrometry and oversaw the creation of the department’s first Air Analysis laboratory analyzing ambient air samples at residential and commercial sites under EPA’s TO-15A methodology.

Mr. Fayo’s research interests lie in the areas of the GC/MS laboratory's quality control program and the integration of analytical instrumentation software with his Excel based spreadsheets for complete automation of quality control, the broad field of environmental health and its impacts on water and air quality (specifically their application to existing GC/MS methodologies) and the continued optimization of specific EPA approved and in-house generated methods like Gasoline Range Organics by GC/MS, EPA TO-15, and EPA 525.3. He has personally authored over a dozen Standard Operating Procedures for the laboratory as well as created over 40 multi-tab Microsoft Excel spreadsheets to fully automate the multitude of specific quality control requirements for the many different types of sample analyses performed in the laboratory. He also co-authored an innovative procedure to analyze Gasoline Range Organic samples by GC/MS methodology at a time when GC-FID instrumentation was the primary means of analysis for this method.