Justin is an Electrical Engineering Graduate of the University of Arkansas. He was hired by Autonetics and his first exposure to computing was the VERDAN computer used in Inertial Navigation Systems (INS) on the Nautilus submarines and airborne bomb/nav systems. Programming was in machine language and toggle switches.
Later he worked for Litton Industries and worked on several military airborne computers controlling INS in the days of disk, drum and even acoustic delay line memory. He worked in the development lab on many types of computers, including Digital Differential Analyzers (DDA) and a machine that used ternary arithmetic.(You already knew that the most efficient computer is one with the base of PI, which is near three).
Ultimately these systems were developed for commercial aircraft. Litton was selected for the Anglo/French Concorde and Justin was assigned to France on a joint venture to produce their LTN-51, Inertial Navigation System. Concorde was the first international aircraft to select the LTN-51.Justin built an early personal computer using the Zilog-80 running CP/M in the 8 inch floppy disk era.