Jeffrey Ullman

Jeffrey David Ullman (born November 22, 1942) is an American computer scientist. He is the Stanford W. Ascherman Professor of Engineering, Emeritus, at Stanford University. 
His textbooks on compilers (various editions are popularly known as the green dragon book), theory of computation (also known as the Cinderella book), data structures, and databases are well known in the field of computer science. 
He and his long-time partner Alfred Aho are the recipients of the 2020 Turing Award.