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Julian Schwinger began the construction of Source Theory in 1966 in responseto the then apparent failure of quantum field theory to describe stronginteractions, the physical remoteness of renormalization, and the utility ofeffective actions in describing chiral dynamics. I will argue that the sourcetheory development was not really so abrupt a break with the past as Julian mayhave implied, for the ideas and techniques in large measure were present in hiswork at least as early as 1951. Those techniques and ideas are still offundamental importance to theoretical physics, so much so that the designation``source theory'' has become superfluous. Julian did a great deal of innovativephysics during the last 30 years of his life, and I will touch on some of themajor themes. The impact of much of this work is not yet apparent. (Invitedtalk at Washington APS/AAPT meeting)

JULIAN SCHWINGER: SOURCE THEORY AND THE UCLA YEARS — From Magnetic Charge to the Casimir Effect