Victor Kac (IMAGE) American Mathematical Society Caption Victor Kac is the winner of the 2015 AMS Leroy P. Steele Prize for Lifetime Achievement. Credit Bryce Vickmark Usage Restrictions Credit Bryce Vickmark License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.