In nuclear and particle physics one is often faced with problems where
perturbation theory is not applicable. An example of this is the description of
bound states. Therefore, an exact solution of field theory to all orders is an
unavoidable and interesting problem. Path integrals provide a framework for
exact solutions in field theory. In this talk I will present an economical
method of evaluating path integrals using the Feynman-Schwinger representation
(FSR).Comment: Invited talk, to be published in the proceedings of 17th European
Conference on Few-Body Problems in Physics, Evora, Portugal, 11-16 Sep 200
