Vaughan Pratt (born April 12, 1944) is a Professor Emeritus at Stanford University, who was an early pioneer in the field of computer science.
Since 1969, Pratt has made several contributions to foundational areas such as search algorithms, sorting algorithms, and primality testing.
More recently, his research has focused on formal modeling of concurrent systems and Chu spaces.
A pattern of applying models from diverse areas of mathematics such as geometry, linear algebra, abstract algebra, and especially mathematical logic to computer science pervades his work.