The guest editors of IEEE Software magazine's September/October issue describe the field of programming languages and why they selected the articles highlighted here. The Web extra at http://youtu.be/SmIc0Chc9Y0 is an audio recording in which author IEEE Software Multimedia Editor Davide Falessi interviews Laurence Tratt and Adam Welc, guest editors of IEEE Software magazine's September/October 2014 issue, about the field of programming languages.