GREGORY A. MARGULIS, Yale University, New Haven, Connecticut, USA
for his monumental contributions to algebra, in particular to the theory of lattices in semi-simple Lie groups, and striking applications of this to ergodic theory, representation theory, number theory, combinatorics, and measure theory

SERGEI P. NOVIKOV, University of Maryland, College Park, Maryland, USA; and the L.D. Landau Institute for Theoretical Physics, Moscow, Russia,
for his fundamental and pioneering contributions to algebraic and differential topology, and to mathematical physics, notably the introduction of algebraic-geometric methods.