physics and electronics relate to microwave oscillations, lattice wave amplification, the Hall effect, quantum electronics, and applications of microwave oscillations to astrophysics. Research in other fields 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. He then became engrossed in APL itself, seeing it as a way to "make a tool to make a tool to do something" (just like his extensive home machine shop). His work on "self documenting code" led to early work in computer viruses. At one point he was mistakenly credited with inventing the term. In the early 1980s, IBM was having problems with particular circuit boards failing even though they had passed their initial reliability tests. He was the first to suggest non-linear measurements to detect incipient opens, and this led to a production tool which effectively solved the problem. Later, he was involved in various task forces addressing the design and reliability of new disk drives. His final area of technical investigation was multi-valued logic. The philosopher Patrick Grim states "J. B. Gunn has done significant work in solving various self-referential sentences in this sense. See for example his 'Notes on an Algebraic Logic of Self-Reference', unpublished. I am obliged to Gunn for extensive and very helpful correspondence. PG" However, IBM was less interested in this area, and he retired from IBM in 1990. Even after retirement, he continued to apply his problem solving approach to his motorcycle racing: "The world is not full of unfathomable mysteries that you can only solve with luck. If you really want to understand why something is happening, you can probably attack it in a scientific way and find out what is going on." Awards and honours He was a member of the National Academy of Engineering and the American Academy of Arts and Sciences, and received the 1969 IEEE Morris N. Liebmann Memorial Award, the Valdemar Poulsen Medal of the Royal Danish Academy of