| Citation | One of the most active and innovative workers in the field of superconducting devices. As a research student he developed an ultrasensitive superconducting galvanometer and subsequently applied it to a wide variety of low temperature measurements. His long-standing interest in noise in circuits employing Josephson junctions has led to a series of progressively more sensitive Quantum interference devices, culminating in one limited only by quantum noise. Clarke and his students have significantly improved the accuracy of magnetotellurics, a geophysical survey technique, by using sensitive superconducting magnetometers and by introducing the remote magnetic reference scheme. He has worked extensively on nonequilibrium properties of superconductors, particularly on new phenomena involving charge imbalance. |