  Julian Schwinger (1918--1994), founder of renormalized quantum
electrodynamics, was arguably the leading theoretical physicist of the second
half of the 20th century. Thus it is not surprising that he made contributions
to gravity theory as well. His students made major impacts on the still
uncompleted program of constructing a quantum theory of gravity. Schwinger
himself had no doubt of the validity of general relativity, although he
preferred a particle-physics viewpoint based on gravitons and the associated
fields, and not the geometrical picture of curved spacetime. This note provides
a brief summary of his contributions and attitudes toward the subject of
gravity.
