is an author of Processing – a very simple environment for digital art. It allows you to create music, video, images and interactive projects, publish them on a web site like Java applet. It is not a difficult programming environment, it works as Sketches, you just open, sketch a code and run it. Has several sister projects like Arduino, Wiring and Processing Mobile.
Ben has written two books on visualizing data.
His site has lots of visualizations and my latest fetish – genetic data and their visualizations.