He now sits in the House of Lords as a non-affiliated member, having formerly been a Labour Party peer.

Mackenzie was born in Darlington and educated at Eastbourne Boys School.

[1] A graduate of the FBI Academy at Quantico, Virginia, he was active in the Police Superintendents' Association and was its President for three years.

[Published by The Memoir Club] In June 2013, following investigations by undercover reporters from the Sunday Times, The Telegraph, and the BBC, in which he was filmed offering to become a paid advocate for a firm pushing for new laws to benefit its business.

[7] Mackenzie held the historical and honorary appointment of Billet Master of the City of Durham between 1989 and 2003.