Dr Charles Clarke has been a consultant neurologist since 1979 and now works at the National Hospital and Whipps Cross Hospital, London. He is the author of Neurological Diseases in Clinical Medicine (editors: Parveen Kumar and Michael Clark; publishers: Elsevier). The sixth edition is now in press. He has been closely involved in the book, written originally by consultants at St Bartholomew”s Hospital, since the first edition in 1987. Dr Robin Howard has been consultant neurologist at the National Hospital and St Thomas” Hospital since 1992. He has a large general neurology NHS practice and is consultant to three neurological intensive care units as well as directing clinical services for patients with motor neurone disease, myasthenia gravis and sleep disorders. He has written extensively – more than 100 peer reviewed papers and 30 review articles/book chapters. Professor Martin Rossor has been in consultant practice since 1986. He is Professor of Neurology at the Institute of Neurology, honorary consultant neurologist at the National Hospital and St Mary”s Hospital. His particular clinical and personal interests are degenerative dementias and cognitive neurology. Professor Simon Shorvon was appointed consultant neurologist at the National Hospital in 1983. His special interests are in epilepsy, imaging and epidemiology. He was previously Medical Director of the National Society for Epilepsy, the leading UK charity in the field of epilepsy and Chairman of the University Department of Neurology in UCL. He has published over 250 peer reviewed articles and 100 chapters and books.