William Durfee is Professor Emeritus Department of Mechanical Engineering at the University of Minnesota, USA. His professional interests include medical device innovation, rehabilitation technology, wearable robots, muscle biomechanics, product design, and design education. He is the immediate past director of the Bakken Medical Devices Center, the immediate past Editor of the ASME Journal of Medical Devices, a fellow of the American Institute for Medical and Biological Engineering, and a member of the Academy of Distinguished Teachers at the University of Minnesota.