Alfred Aho and Jeffrey Ullman (IMAGE) Association for Computing Machinery Caption Alfred Aho of Columbia University and Jeffrey Ullman of Stanford University are the recipients of the 2020 ACM A.M. Turing Award, which is often referred to as the "Nobel Prize of Computer Science." Credit Association for Computing Machinery Usage Restrictions None 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.