Barbara Liskov was one of the first women in the U.S. to earn a PhD in computer science, among her Turing Award and memberships in the National Academy of Engineering, the ACM, and MIT, where she works as a professor. Liskov is a pioneer in the development of programming languages; her ideas can be found permeating nearly all of today’s widely used programming languages. Liskov led in the development of CLU, an object-oriented language, and Argus, a distributed language. Aspects of both languages would find their way into popular programming languages such as C#, C++, and Java.