Russell Whitehead studied English Language and Literature at Oxford University and Applied Linguistics at London University. He was a teacher and self-access co-ordinator for 12 years and has been a freelance author and consultant since 1997. He has been closely involoved in many Cambridge Esol tests, including FCE, CAE, CPE, BEC, BULATS and IELTS. He has done consultancy work for universities including Cambridge, London and Kent and the British Council. He has written several practice test books for BEC as well as on-line materials, workbooks, a teacher's book, and contributions to coursebooks. Mark Harrison has been a professional ELT author for 15 years. He has written a wide range of practice test books, for the IELTS, FCE, CAE, CPE and BEC exams. He has also been the Chair of and a writer for a variety of Cambridge exams, including IELTS, FCE, CAE, CPE and BEC. In addition, he has written both grammar and vocabulary books, and contributed to dictionaries, CD-ROMs and online materials.