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A field-theory-based approach to pion photoproduction off the nucleon is usedto derive a microscopically consistent formulation of the fully dressedelectromagnetic nucleon current in an effective Lagrangian formalism. It isshown how the rigorous implementation of local gauge invariance at all levelsof the reaction dynamics provides equations that lend themselves to practicallymanageable truncations of the underlying nonlinearities of the problem. Therequirement of consistency also suggests a novel way of treating the pionphotoproduction problem. Guided by a phenomenological implementation of gaugeinvariance for the truncated equations that has proved successful for pionphotoproduction, an expression for the fully dressed nucleon current is giventhat satisfies the Ward-Takahashi identity for a fully dressed nucleonpropagator as a matter of course. Possible applications include meson photo-and electroproduction processes, bremsstrahlung, Compton scattering, and $ee'$processes off nucleons.

Dressing the electromagnetic nucleon current