also led the center’s institutional direction in budget formulation and integration, facilities master planning, workforce strategy, and procurement. Prior to joining NASA, Mr. Christiansen was an aerospace engineer at General Dynamics and a lecturer at California State Polytechnic University-Pomona. He earned his M.S. in aeronautics and astronautics from Stanford University.

ROBERT A. COWART is director of Supersonic Technology Development at Gulfstream Aerospace Corporation, where he has worked for more than 18 years. His background spans a broad range of disciplines, including structures, systems, ground/flight test, and various R&D activities. He has worked in production, service, and completion engineering roles at Gulfstream. His current work involves managing supersonic research focusing on sonic boom mitigation and enabling civil supersonic overland flight. He serves on the Federal Aviation Administration’s PARTNER advisory board advocating supersonics and participates in CAEP’s WG1/Supersonic Task Group (SSTG). Gulfstream has successfully executed two key flight programs with NASA: F-15 Quiet Spike and F-18 External Vision System (XVS), and has played key roles in other flight activities related to NASA’s low-sonic-boom research. He received a B.S. and an M.S. in aeronautical engineering from Georgia Tech.

JOHN B. HAYHURST is retired as senior vice president of the Boeing Company and president of Boeing Air Traffic Management. Previously, Mr. Hayhurst was vice president of business development for the Commercial Airplane Services business unit of Boeing Commercial Airplanes Group (BCAG). Prior to this assignment, he served as vice president and general manager of 737 aircraft programs. In addition, he was general manager of the BCAG production site in Renton, Washington. Before that, he served as vice president for Boeing Americas and was responsible for the Boeing business relationships with airline customers in North America and Latin America and for the sale of Boeing commercial airplanes to customers in those regions. Mr. Hayhurst joined Boeing in 1969 as a customer support engineer. He held positions of increasing responsibility related to commercial airplanes and in 1987 was promoted to vice president of marketing. In this position, he played a significant role in the launch of the Boeing 777. Subsequently, he was responsible for leading teams planning the design, development, and manufacture of aircraft larger than the Boeing 747. He then served as vice president-general manager of the Boeing 747-500X/600X program. Mr. Hayhurst is a fellow of the Royal Aeronautical Society and holds a B.S. in aeronautical engineering from Purdue University. He received an M.B.A. from the University of Washington in 1971. In 1998, Mr. Hayhurst was awarded an honorary doctorate in engineering by Purdue University. He is currently a member of the Aeronautics and Space Engineering Board.

TIMOTHY LIEUWEN is a professor of engineering at the School of Aerospace Engineering at Georgia Institute of Technology and an expert in propulsion engineering. Dr. Lieuwen is the author of Combustion Instabilities in Gas Turbines and Syngas Combustion. His research lies at the intersection of combustion, fluid mechanics, acoustics, and controls. Much of his work is directed toward the development of clean combustion energy systems for power generation, aircraft propulsion, and the refining/process industries. His work involves coordinated experiments, computations, and theoretical analyses. Experiments generally use state-of-the-art laser diagnostics to characterize the unsteady velocity field and flame dynamics. He also uses computations to simulate flame and flow dynamics, and theoretical analyses to provide insight for limiting cases. He served previously on the NRC aeronautics decadal survey Propulsion and Power Panel.

RONALD F. PROBSTEIN is the Ford Professor of Engineering, Emeritus, at the Massachusetts Institute of Technology. His career centered on scientific applications of fluid mechanics, both theoretical and experimental, to numerous areas of conceptual, economic, or societal importance, including hypersonics, dust comets, desalination, physicochemical hydrodynamics, synthetic fuels, in situ soil remediation with electric fields, and slurry rheology. His contributions to the fields of hypersonics, rarefied gas flow, desalination, and water purification earned him election to the National Academy of Sciences and the National Academy of Engineering. As a fluid dynamicist, Dr. Probstein carried out fundamental and applied studies of hypersonic and physicochemical flows. His research on hypersonic viscous and rarefied gas flows played a significant role in ICBM and spacecraft reentry development.

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