A. D. Garrett is the pseudonym for the writing collaboration of prize-winning thriller writer Margaret Murphy and forensic scientist Professor Dave Barclay.
Margaret Murphy is the author of nine psychological thrillers. She lectures on writing and is a former Royal Literary Fund Writing Fellow. She is founder of Murder Squad, a touring collective of crime writers, and was Chair of the Crime Writers' Association in 2009-10.
Professor Barclay holds two university posts and is a forensic adviser to the police forces and the media. He was Head of Physical Evidence at the UK National Crime and Operations Faculty for 10 years. He is currently working for several UK police forces and a state of Australia on high profile murders. He is part of the 'Murder, Mystery and Microscopes' team which aims to explain the real science behind popular crime fiction via a national series of public lectures. Everyone Lies is their first collaboration.