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Expert is currently working on constitutive modeling of the extensional behavior of molten plastics. He has developed models that allow the behavior in extension to be inferred from measurements in exponential shear. The material behavior in exponential shear is measured more easily than in extension.

As a teacher of graduate and undergraduate courses in plastics processing, he is knowledgeable in the field of non-Newtonian fluid mechanics.

Through his doctoral research on rheological measurements and his continued development of rheological instrumentation, Expert has played a leadership role in rheological measurement, publishing extensively on this.

As a result of his research on sliding plate rheometry, Expert has become an expert on controlled-strain experiments in simple shear on polymer melts, especially under large deformations.

Expert has developed special transducers for measuring the local shear stress in molten plastics, as in a sliding plate rheometer.

Through his research on the solidification of plastic pipe, he is knowledgeable of combined problems of fluid flow with melting and with freezing. His current research efforts includes an investigation of the meltability of cheese.

As a result of his doctoral research, continued research, and teaching at both the graduate and undergraduate level, Expert has established a position of world leadership on melt rheology. His research includes measurement of the steady shear behavior, linear viscoelastic response, and behavior in large deformations.

Through teaching graduate and undergraduate courses in plastics processing, Expert is an expert on the flow and deformation of polymeric liquids. He is an expert on polymer melt flow rheology.

Through his supervision of graduate research, and through undergraduate and graduate teaching of plastics processing, he has established a leadership position in polymer processing, especially in the field of plastics processing. He is knowledgeable of film blowing, blow molding, injection molding, and plastic pipe extrusion. Through highly specialized research, he has established a leadership position on the problem of sag during plastic pipe extrusion. Through on-going research, he has become knowledgeable on the die lip build-up in extrusion (also called die drool). He is also knowledgeable of sheet extrusion and calendering.

He has extensive experience measuring and interpreting the relaxation behavior of molten plastics. His research includes the measurement and interpretation of both linear and nonlinear relaxation behaviors.

As a result of his in-depth research on rheological measurements and continued development of rheological instrumentation, Expert has established a position of world leadership on rheometer development. He has expertise on the development and commercialization of new rheometers.

As a summer student, he once operated a nylon spinning line. His ongoing research on extensional rheology makes him knowledgeable of melt spinning, especially on the role played by rheology in melt spinning.

Through ongoing research and undergraduate and graduate teaching of plastics processing, Expert has gained expertise on the measurement and interpretation of viscoelastic properties. His research includes the measurement and interpretation of both the linear and nonlinear viscoelastic properties.

He is also an expert on the measurement and interpretation of the stress relaxation behavior of molten plastics. His research includes measuring and interpreting both the linear and nonlinear stress relaxation behaviors.

He has advanced knowledge of the viscoelasticity of polymeric liquids. He is also knowledgeable on the viscoelasticity of polymeric solids. His research includes the measurement and interpretation of both the linear and nonlinear viscoelastic properties.

Stemming from two years of industrial research and many years of related work on extrusion, he is knowledgeable of polymer fracture. He is an expert on the failure of extruded plastic pipe.

He is an expert on the rheology of molten plastics, and especially on the role played by rheology on melt processability. He is an expert on the flow of molten plastics.

Expert has years of experience working on plastic pipe processing.

Expert is working on the role played by rheology on the thermoforming of polymer sheet.

His laboratory is equipped with capillary rheometers, including melt indexers. He has his Expert in rheometry.

Expert has taught fluid dynamics at the graduate level during his visiting professorship at the National University of Singapore. He also teaches macromolecular hydrodynamics, the fluid dynamics of polymeric liquids.

He developed and teaches the graduate course on food rheology at the University of Wisconsin - Madison.

He is a professional rheologists. He teaches and conducts University research on non-Newtonian fluid flow, especially on molten plastics.

He has published extensively on non-Newtonian liquid flow, especially on manufacturing flows such as plastics processing.

He used to operate a nylon spinning line at the Kingston Nylon Works of DuPont Canada. He now teaches graduate courses on polymer processing, including sections on spinning.

He is an expert on plastics injection molding. He has published on core deflection and flash in injection molding.

He is an authority on developing the working equations for plastics processing equipment. Expert is an accomplished teacher on the design of plastics processing equipment.

Expert has published extensively on plastic pipe, including on simulating the extrusion of polyethylene pipe. The study of sag in HDPE pipe extrusion is one of Expert's specialties.

Expert has published on the rheology of filled plastics.

Expert is an authority on polymer extrusion, including plastics pipe extrusion.