Tadayoshi (Yoshi) Kohno is an Assistant Professor of Computer Science and Engineering at the University of Washington. He worked as a cryptography and computer security consultant with Bruce Schneier, back when Counterpane Systems had less than a handful of full-time cryptographers and before the days of Counterpane Internet Securities, Inc. Since then he's conducted published security analyses of technologies as varied as: electronic voting machines, implantable wireless defibrillators, file encryption systems, popular consumer devices, and ISP ad injectors. Kohno has a Ph.D. in Computer Science (cryptography) from the University of California at San Diego.