This material records Bullard's long association with IBM both as a user of the computer firm's data processing facilities and, for the period 1965-75, as a director of IBM UK. The very extensive correspondence relates to board meetings, fees and expenses, technical questions of computer performance, contacts made by Bullard for IBM in the universities, industry and government departments, and symposia, lectures, and other educational, scientific, cultural and social events organised or sponsored by IBM. There is also correspondence regarding a substantial gift from IBM to the University of Cambridge (E.83, E.84). For lectures given by Bullard for IBM see G.152, G.163