In 1999, he was awarded the National Medal of Science by President Bill Clinton, for his "key role in the explosive growth of nonlinear functional analysis and its applications to partial differential equations in recent years".
1999年，他被比尔·克林顿总统授予美国国家科学奖章，因为他「近年来在非线性功能分析爆炸性增长中的关键作用及其在偏微分方程中的应用」。