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Joe has made many contributions in the areas of unified interaction models, non-leptonic decays, neutrino physics, and the application of effective Lagrangian tequniques in QCD. Most recently, attention has been focused on the last topic. The underlying motivation for the effective Lagrangian approach is that the basic dynamical variables of the gauge theories of present interest are typically rather distant from observable states. It is nescessary to use variables that are closely related to observational quanities and to understand how the underlying symmetries constrain their interactions. The methods often have applicability to many situations and various fields. |