XANTHOPOULOS INTERNATIONAL AWARD
THE SELECTION COMMITTEE
having taken into account the nominations for the award and
1991 Xanthopoulos Award
Professor of Physics at the Courant Institute of the New York University
for his many basic contributions to rigorous mathematical results in the general theory of relativity. They include: i) the boost theorems which establish the existence of a large class of solutions to Einstein's (and Yang-Mills) equations in a region obtained by boosting the initial Cauchy surface a finite amount; ii) a complete mathematical analysis of the spherical collapse of a scalar field including the structure of the horizons and singularities; and iii) his work with Klainermann on the global existence of solutions to Einstein's equations with weak initial data.