John Carroll is currently Director, Geostorage Processing Engineering for Gas Liquids Engineering, Ltd. in Calgary. With more than 20 years of experience, he supports other engineers with software problems and provides information involving fluid properties, hydrates and phase equilibria. Prior to that, he has worked for Honeywell, University of Alberta as a seasonal lecturer, and Amoco Canada as a Petroleum Engineer. John has published a couple of books, sits on three editorial advisory boards, and he has authored/co-authored more than 60 papers. He has trained many engineers on natural gas throughout the world, and is a member of several associations including SPE, AIChE, and GPAC. John earned a Bachelor of Science (with Distinction) and a Doctorate of Philosophy, both in Chemical Engineering from the University of Alberta. He is a registered professional engineer in the province of Alberta and New Brunswick, Canada.