The sources of Schwinger's Green's functions.

  title={The sources of Schwinger's Green's functions.},
  author={Silvan S. Schweber},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={102 22},
Julian Schwinger's development of his Green's functions methods in quantum field theory is placed in historical context. The relation of Schwinger's quantum action principle to Richard Feynman's path-integral formulation of quantum mechanics is reviewed. The nonperturbative character of Schwinger's approach is stressed as well as the ease with which it can be extended to finite temperature situations. 
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