Zachary Katznelson became senior counsel of civil rights organisation Reprieve in February 2006 and has since been a luminary in the fight against civil and human rights abuses committed in the name of the 'War on Terror'.

Katznelson's work has included putting pressure on the UK Crown Prosecution Service for allegedly failing to investigate claims of Government ministers' involvement in 'torture flights', in which terrorist suspects were allegedly flown to CIA prison camps for torture.

Under the European Convention for the Prevention of Torture and Inhuman or Degrading Treatment or Punishment, UK authorities could face prosecution if they are found to have allowed prisoners likely to face such treatment to be flown through UK airports or airspace.

Katznelson is also representing more than 40 Guantanamo detainees, some of whom have been held at the notorious prison camp for four years without trial.