Sheelagh Deller is an experienced teacher, teacher trainer, trainer trainer, and ELT author. She has worked primarily for Pilgrims and the British Council. She has long experience in training trainers and teachers all over the world, and is a regular plenary speaker at international conferences. Over the last 4 years she has run two-week courses at Pilgrims for teachers of other subjects in English (CLIL), and has drawn on this experience to develop this methodology. She has written a number of ELT books, which include a coursebook, some workbooks, teachers' books, teachers' resource books, and a book of photocopiable materials.