"Unix has, I think for many years, had a reputation as being difficult to learn and incomplete. Difficult to learn means that the set of shared conventions, and things that are assumed about the way it works, and the basic mechanisms, are just different from what they are in other systems."
Canadian computer scientist known for foundational work in software engineering and programming languages. He co-authored The C Programming Language and co-developed tools and methods used across computing. His writing and research have had lasting influence on computer science education.