Chris Clark is a retired police intelligence officer. He is the author of several books on investigations into serial killers Christopher Halliwell, Peter Sutcliffe, Angus Sinclair and Robert Black. He participated in a major ITV documentary on Sutcliffe following his death in 2020.
Tim Hicks is a retired chartered accountant with experience in audit, fraud investigation and data processing. He was an officer in the Territorial Army, where he received training in intelligence collation and assessment. Tim is now a member of the National Union of Journalists and the Crime Writers Association, writing on crime and intelligence subjects. His research has been published in The Times, Sunday Express, Daily Mirror, Sun, Private Eye, North Yorks Enquirer, Yorkshire Post, Birmingham Post and The Journalist.
