Dr. Lemmon received his Ph.D. at the University of Idaho in 1996. The dissertation introduced a new Helmholtz energy model for mixtures of hydrocarbons, cryogens, and refrigerants based on a generalized excess Helmholtz energy concept. His current work focuses on the Refprop program (www.nist.gov/srd/nist23.cfm) and on national and international standards for the properties of natural gas.
He is the chair of the ISO committee that will publish the next standard for the equation of state for these mixtures. Dr. Lemmon has developed many equations of state and a new nonlinear fitting technique that allows operations that are not available in linear methods. This has resulted in much smaller equations that extrapolate without limits in all directions.