He co-authored influential texts like Principles of Database Systems and Compilers: Principles, Techniques, and Tools (often called the “Dragon Book”), which have shaped generations of computer science students. Jeffrey received the 2020 Turing Award together with Alfred Aho “for fundamental algorithms and theory underlying programming language implementation and for synthesizing these results and those of others in their highly influential books, which educated generations of computer scientists.” Kevin Ball or KBall, is the vice president of engineering at Mento and an independent coach for engineers and engineering leaders.