Donald McIntyre: Geologist, Historian, and Array Language Advocate, 1923–2009

Donald McIntyre was known throughout the APL and J community as the author of numerous papers on first APL developed by Kenneth Iverson and then on what Iverson termed the language\´s "modern dialect" J. Both languages are implemenations of what was termed Iverson Notation, initially developed by Iverson while a graduate student at Harvard. McIntyre attended most of the APL conferences and his presentations as well as his presence were always welcome. It was known, of course, that he was a geologist—and a Scottish geologist at that—who had strayed into computing in 1964 when Pomona College, where he was professor of geology, ordered an IBM System 360/40. However, what was not so well known in the computing community was his outstanding reputation as a geologist who made important contributions to the geology of Scotland and its history. While emphasizing McIntyre\´s work in computing, we shall not neglect his contributions to geology nor his wide range of interests including mountaineering and bagpipe playing.