Abstract :
Kenneth Iverson, whose dissatisfaction with conventional mathematical notation as a graduate student led to the development of the APL and J languages, died in Toronto, Ontario on 19 October 2004 in his 84th year. This article reviews his early education, his graduate work at Harvard, and his careers with IBM in the United States and I. P. Sharp in Canada, and his retirement when he developed J, which he considered a modern dialect of APL.
