TL;DR: This note introduces Peter Landin's 1965 technical report “A Generalization of Jumps and Labels”, which is reprinted in this volume and explains Landin’s control operator J in more contemporary terms.
Abstract: This note introduces Peter Landin‘s 1965 technical report “A Generalization of Jumps and Labels”, which is reprinted in this volume. Its aim is to make that historic paper more accessible to the reader and to help reading it in context. To this end, we explain Landin‘s control operator J in more contemporary terms, and we recall Burge‘s solution to a technical problem in Landin‘s original account.