From his appointment as a Scientific Officer at the Radio Division of the National Physical Laboratory in 1938, which marked the start of his active collaboration with Sir Edward Appleton, to his death in 1996, Granville Beynon's chosen field of scientific endeavour was the study of the ionosphere, the atmosphere at heights where the concentration of free electrons is sufficient to influence the propagation of radio waves. Through his establishment of research groups at Swansea and Aberystwyth Colleges of the University of Wales, and his tenure of senior offices in appropriate national and international committees, he had a major influence in this area of science. His involvement in university education included a period as Vice–Principal at Aberystwyth, but his interest in education extended beyond the university sector and this was marked by his service as Chairman of the Schools Council Committee for Wales. For his services to science and education he received several honours at both national and international levels. In spite of the many demands on his time, he enjoyed a very happy family life in which music played a central part.