We give a selective survey of topics in algebraic deformation theory ranging
from its inception to current times. Throughout, the numerous contributions of
Murray Gerstenhaber are emphasized, especially the common themes of cohomology,
infinitesimal methods, and explicit global deformation formulas.Comment: To appear in "Higher Structures in Geometry and Physics", papers in
honor of M. Gerstenhaber and J. Stasheff, A. Cattanneo, A. Giaquinto, and P.
Xu, eds. Birkhauser Progress in Mathematics, 201