My favorite mad scientist other than Nichola Tesla is musician/technician Raymond Scott. Carl Stalling used the Scott themes to great effect in the Warner Brothers Cartoons. Ray was also a father to electronic music and so much more.
Scott's son Stan Warnow is making a documentary about his father's life, and it looks wonderful. The Raymond Scott Documentary will be called 'On to Something'. Check out the trailer here: http://musicthing.blogspot.com/2008/06/raymond-scott-documentary-on-to.html