SELECTED EMPLOYEE PROFILESJohanna M.H. Anneke Levelt Sengers (Scientist Emeritus)
As a research physicist, Levelt Sengers and her collaborators worked on critical phenomena in fluids and fluid mixtures, from theory to experiment and databases for practical application. They developed critical-region scaling concepts for fluids and fluid mixtures, and for solubility behavior near a solvent's critical point. They also performed measurements of density, phase behavior and other properties of industrially important fluids such as carbon dioxide, ethylene, water and geothermal fluids. They worked on databases for properties of water and steam for applications in science and in the electric power industry that included critical properties, and refractive index and dielectric constant correlations up to high pressures and temperatures. Several of these are standards of the International Association for the Properties of Water and Steam (IAPWS), and some are embedded in the ASME Steam Tables. As a NIST group leader (1978-87), Levelt Sengers oversaw projects related to alternative refrigerants, ionic fluids criticality, and supercritical fluids. She co-organized the first NATO Summer School on Supercritical Fluids in Kemer, Turkey, in 1993. She has published extensively in the archival literature, and contributed 14 book chapters. Since her retirement from NIST in 1994, she has written on the history of her field of thermodynamics, including a book titled How Fluids Unmix in 2002. Very recently, as the co-chair of a panel of the InterAcademy Council, she co-authored a report "Women for Science" to advise the world's science and engineering academies on how to attract, retain and promote more women in science and technology worldwide. Levelt Sengers has been an active member of what is presently the ASME Research Subcommittee on the Properties of Water and Steam. This subcommittee is responsible for maintaining and upgrading the ASME International Steam Tables. It also serves as the U.S. National Committee to the IAPWS and Levelt Sengers was the U.S. national representative to the IAPWS (1990-2004). At the request of the ASME Heat Transfer Division's Committee on Thermophysical Properties, Levelt Sengers organized the 12th Symposium on Thermophysical Properties held in Boulder, Colorado, in 1994, and served as a co-editor of the proceedings. Levelt Sengers is a fellow of ASME, the American Physical Society and the American Association for the Advancement of Science, and an Honorary Fellow of the IAPWS. She was elected to the National Academy of Engineering and the National academy of Sciences, and is a correspondent of the Royal Netherlands Academy of Arts and Sciences and a member of the Royal Holland Society of Sciences and Humanities. Among her other honors are NIST and Department of Commerce awards, the Interagency Committee for Women in Science and Engineering's WISE Award (1985) and the L'Oréal-UNESCO for Women in Science Award (2003). Levelt Sengers received her candidaats (rough equivalent of bachelor's degree) in physics and chemistry in 1950 at the University of Amsterdam, Netherlands. She continued her education there and earned her doctoraal (rough equivalent of master's degree) and Ph.D. in physics in 1954 and 1958, respectively. She holds an honorary doctorate (1992) from Delft University of Technology, Netherlands. Link to a listing of Ms. Sengers' Publications and Talks William M. "Mickey" Haynes (Scientist Emeritus)
In 1985 Mickey became Group Leader of the Properties of Fluids Group in the Thermophysics Division and served in that capacity for ten years. In 1989 he assumed the position of Deputy Chief of the Thermophysics Division, which was reorganized and became the Physical and Chemical Properties Division in 1996. While remaining in the Deputy Chief position, Mickey became the Assistant Director for Boulder of the Chemical Science and Technology Laboratory (CSTL) in 1994. He stayed in these positions until becoming the Chief of the Physical and Chemical Properties Division in 1999. Mickey remained in this position until he retired in January 2003. Haynes served on the Editorial Boards of the Journal of Chemical and Engineering Data, Review of Scientific Instruments, and Cryogenics. At the request of the ASME Heat Transfer Division’s K-7 Committee on Thermophysical Properties, he was Chair and Organizer of the 13th and 14th Symposia on Thermophysical Properties in 1997 and 2000, respectively. Mickey has been previously active on ASTM Committee D03 on Gaseous Fuels (Chair of the ASTM Subcommitte D03.08 on Thermophysical Properties) and the ASME K-7 Committee on Thermophysical Properties. He has recently served on the International Advisory Committees of the 16th and 17th European Conferences on Thermophysical Properties, the 6th and 7th Asian Thermophysical Properties Conferences, and the 17th IUPAC Conference on Chemical Thermodynamics. Mickey was elected as a Fellow of the American Physical Society in 1999 and has received several Department of Commerce (DOC)/NIST awards. Since his retirement in 2003, Mickey has remained active in several areas. Currently, he is a Scientist Emeritus in CSTL. He has been the Editor-in-Chief of the International Journal of Thermophysics since 1997. Mickey was the President of the Executive Board responsible for organization of THERMO International, a joint conference comprised of; the 16th Symposium on Thermophysical Properties, the 19th IUPAC Conference on Chemical Thermodynamics, and the 61st Calorimetry Conference held in Boulder in August, 2006. He has been a member of the ASME K-7 Committee on Thermophysical Properties since 1992 and is currently serving on the Touloukian Award Committee. Since 1998, Mickey has been a permanent member of the International Organizing Committee of the European Conference on Thermophysical Properties; he is also currently serving on the International Advisory Committee of the Asian Thermophysical Properties Conference. In addition to these technical activities, Mickey tries to find time during his “retirement” for his other interests such as golf, squash, hiking, biking, and travel. |
Dr. Levelt Sengers joined the National Bureau of Standards (First Washington, D.C., then Gaithersburg, Md.) in 1963. The agency was renamed the National Institute of Standards and Technology (NIST) in 1988. 
Mickey Haynes joined the National Bureau of Standards in 1970 as a National Research Council Postdoctoral Research Associate after completing his Ph.D. in physics at the University of Virginia. During this associateship he carried out an experimental program on the viscosity of cryogenic fluids. In 1972 he became a permanent staff member and was involved in research on measurements and correlations of the thermophysical properties of fluids and fluid mixtures of scientific and industrial interest. He was involved in major projects on the properties of natural gas, cryogenic fluids, air, alternative refrigerants, and ammonia/water systems. Mickey was responsible for the development of state-of-the-art apparatus for measurements of both transport and thermodynamic properties of fluids (e.g., magnetic suspension densimeters and torsional crystal viscometers). The apparatus were used for fluid thermophysical property measurements at low and high temperatures and at extreme pressures; and for the development of empirical and theoretical models for the prediction of fluid properties. 
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