Dean L. Kamen is one of the few people alive today who really impresses me with his brilliance. Any fool can be smart. But few can be as smart an creative as Dean L. Kamen. His Wikipedia profile does not do him justice.
To be sure, some of his stuff is over hyped. I never did think that much of the Segway. But a lot of his other feats were truly amazing. This clip shows off his most recent product.
Edit: This profile of Kamen from Wired is better, even if it is dated