Friends David Turner was one of the two people who changed my life by introducing me to functional programming (*). David designed and implemented a succession of functional languages, Sasl, KRC, and Miranda, that made lazy functional programming into a tool you could use to get work done. They all used SK-combinator reduction in their implementations, a technique of irresistibly simple beauty, invented by Curry and Feys, but refined and popularised by David. For David’s 70th birthday, the Journal of Universal Computer Science is running a special Festschrift issue on “Functional programming: past, present, and future” in David’s honour. The Call for Papers is attached. Here’s the timetable. · 1 July 2016: Paper submissions. · 1 September 2016: Author notification. · 1 October, 2016: Revised version due. · 15 October 2016: Final notification. · 30 October 2016: Camera Ready Copy. Do consider submitting a paper. Simon (*) Arthur Norman was the other.