Nonperturbative Renormalization of QED in Light-Cone Quantization
  As a precursor to work on QCD, we study the dressed electron in QED nonperturbatively. The calculational scheme uses an invariant mass cutoff, discretized light-cone quantization, a Tamm--Dancoff truncation of the Fock space, and a small photon mass. Nonperturbative renormalization of the coupling and electron mass is developed. 
J. R. Hiller (U. Minn, Duluth) and S. J. Brodsky (SLAC)