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.
This is an inspirational video. There are many good ideas and demonstrations in this video. At around 29:25, Bret shows the creation of an animation sequence both with Flash and an iPad app that shows some remarkable insights into a possible animation UI.
Bret's personal site is here.