Jo Locke is a Biology teacher and author of many science school books, notably Activate and AQA Activate, as well as OCR GCSE Biology. Helen Reynolds has written for Activate, AQA Activate, OCR GCSE Physics, and Oxford Revise AQA GCSE Sciences. She has been a Physics teacher for many years, working previously for the Institute of Physics, and is currently teaching in Arizona. Philippa Gardom Hulme is author of Activate and AQA Activate, as well as OCR GCSE Chemistry, on which course she was also the Series Editor. Previously a Chemistry teacher and latterly a tutor for the PGCE in Science at Oxford University, she currently works in science communication at the University of Bristol.