John Cocke
Gunn stopped working on semiconductor physics in 1972, and pursued a number of different interests in his role as IBM Fellow. He spent nearly three years developing an APL computer model of a computer-controlled car, which showed that fuel consumption could be halved. This was part of a joint effort with John Cocke, who made major contributions to computer architecture, and R. A. Toupin in a study, that used computer simulation to investigate regenerative braking, a high-pressure hydraulic system to store energy, and several other topics that are now quite common practice.