He held a Alfred P Sloan Foundation Fellowship in 1974-75. In 1976 his work on foliations led to his being awarded the Oswald Veblen Geometry Prize of the American Mathematical Society .
Siya hawak ng isang Alfred P Sloan Foundation Fellowship sa 1974-75. 1976 Sa kanyang trabaho sa foliations na humantong sa kanyang pagiging iginawad sa Oswald Veblen geometry Prize ng Amerikanong matematiko Society.