Jeff Ullman is a prominent computer scientist known for his contributions to the fields of algorithms and programming languages. He is a professor emeritus at Stanford University and has authored several influential textbooks, including "Compilers: Principles, Techniques, and Tools," commonly referred to as the "Dragon Book." His work has significantly shaped computer science education and research. In addition to his academic achievements, Ullman has been involved in various research projects and has co-founded companies in the tech industry. He has received numerous awards for his contributions, including the ACM Turing Award, which is often regarded as the "Nobel Prize of Computing."