Hugh Herr is creating bionic limbs that emulate the function of natural limbs.  Time Magazine coined Dr. Herr the "Leader of the Bionic Age" because of his revolutionary work in the emerging field of Biomechatronics - technology that marries human physiology with electromechanics.  A double amputee himself, he is responsible for breakthrough advances in bionic limbs that provide greater mobility and new hope to those with physical disabilities.  He is currently Professor of Media Arts and Sciences at the MIT Media Lab, and co-leads the Yang Center for Bionics at MIT.