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cruited and nurtured several young faculty members who went on to become international leaders in their fields as well as NAE members. He supervised many Ph.D. students and postdoctoral fellows who today hold responsible positions in universities and industrial research laboratories around the world.

His research publications are indicative of the breadth of his interests and knowledge. How many chemical engineers could write significant contributions on such widely varying topics as prediction of vapor pressures, reciprocal variational principles, kinetics of benzene hydrogenation, chemical kinetics and reaction engineering, multicomponent diffusion, orthogonal collocation, measurement of diffusivities, droplet vaporization, kinetic theory of rigid dumbbell suspensions, tokamak reactors, thermal diffusion, catalysis, corrosion, parameter estimation, Bayesian statistics, strategies for process modeling and parameter estimation, viscoelastic fluid dynamics, insulation qualities of animal fur, sensitivity analysis, and distillation column design? Whereas most professors tend to become very specialized, Warren Stewart was an impressive generalist. When he served as department chairman, he was able to discuss with all faculty members the details of their ongoing research programs. No other department chairman in the last half-century has been able to do that.

Warren published well over 100 research papers, many containing an impressive amount of detail. He wrote several systematically organized series of reviews of many important transport problems, invariably using his facility in applied mathematics. The first of these series dealt with the boundary-layer theory for momentum, heat, and mass transfer in laminar, multicomponent systems. Then came a series of papers in AIChE Journal dealing with forced convection in three-dimensional flows: I (1963); II (1970); III (1983); IV (1988); the second of these is the famous paper dealing with transport across mobile interfaces, coauthored with J.B. Angelo and E.N. Lightfoot. Then in 1974, there was a series of four papers with J.P. Sørensen dealing with computation of forced convection in slow flow through ducts and packed beds, published in Chemical Engineering Science.

Among Warren Stewart’s most important technical contribu-

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