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Christian has 16 years investigative policing experience, mainly in the covert arena. As well as being a published author, with several literary projects in the pipeline, he has private sector experience in covert investigations, security management and planning, risk and loss prevention, surveillance, physical security and training.

A qualified CELTA English teacher, Christian is able to speak fluent French, excellent Russian and German, and rudimentary Dutch.

Christian has appeared on several BBC radio programmes, including the World Service and Radi0 4. He has been featured on Channel 5 TV, The Discovery Channel and ITV, as well as in articles in The Times, The Sun and The Observer. He is widely sought for his insight and commentary into undercover and traditional policing in the UK. Christian has provided consultancy for impending TV drama.

Christian currently works in the private sector.