Bret Victor - Inventing on Principle by CUSEC. Bio: Bret Victor invents tools that enable people to understand and create. He has designed experimental UI concepts at Apple, interactive data graphics for Al Gore, and musical instruments at Alesis.
The Clojure language is a dynamically typed, simple and elegant Lisp that is built on top of the Java Virtual Machine. It can interoperate with all of the existing Java libraries and abstracts the ugliness of the underlying language.