  SUSY breaking and its mediation are among the most important problems of
supersymmetric generalizations of the standard model. The idea of
gravity-mediated SUSY breaking, proposed in 1982 by Arnowitt, Chamseddine and
Nath, and independently by Barbieri, Ferrara and Savoy, fits naturally into
superstring theory, where it can be realized at both classical as well as
quantum levels. This talk is dedicated to Pran Nath on his 65th birthday.
