The string theory introduced in early 1971 by Ramond, Neveu, and myself has
two-dimensional world-sheet supersymmetry. This theory, developed at about
the same time that Golfand and Likhtman constructed the four-dimensional s
uper-Poincare algebra, motivated Wess and Zumino to construct supersymmetri
c field theories in four dimensions. Gliozzi, Scherk, and Olive conjectured
the spacetime supersymmetry of the string theory in 1976, a fact that was
proved five years later by Green and myself.