Dr Erzin lioglu is a practising forensic scientist. He has been working on criminal cases (mostly murder) for over twenty years, investigating over five hundred in Britain and abroad. He was formerly Senior Research Associate at Cambridge University and, subsequently, Director of the Forensic Science Research Centre at Durham University. He is now an Honorary Lecturer at London University. He is working on Evidence, a book which looks at the interpretation of evidence in criminal trials and historical events.