His co-accused, Talha Ahsan, who was also extradited, was diagnosed with Asperger's in June 2009, according to a European Court of Human Rights judgement.
The US authorities will make plain in the trial that Mr Ahmad and Talha Ahsan (who was never arrested by British police) were operating the website in London.
During their last ditch attempt to avoid extradition, lawyers for Babar Ahmad and Talha Ahsan pressed the CPS in court to clarify why there had never been a charge in the UK. The CPS said it considered some charges - but had insufficient evidence to prosecute.