Fred Baldassare is Principal Geoscientist and owner of Echelon Applied Geosciences Consulting. He has more than 20 years of experience investigating incidents of stray gas migration. He previously served as the statewide consultant for the Pennsylvania Department of Environmental Protection for investigating and characterizing sources of stray carbon dioxide and methane. Baldassare helped pioneer the application and advancement of isotope geochemistry to identify the origin of stray and natural gases in the Appalachian Basin. He has authored and co-authored numerous professional papers for peer-reviewed publications on the application of isotope geochemistry.