  We propose a multiloop generalization of the Bern-Kosower formalism, based on
Strassler's approach of evaluating worldline path integrals by worldline Green
functions. Those Green functions are explicitly constructed for the basic
two-loop graph, and for a loop with an arbitrary number of propagator
insertions. For scalar and abelian gauge theories, the resulting integral
representations allow to combine whole classes of Feynman diagrams into compact
expressions.
