Bill is a practising barrister and Professor of Law at Birkbeck, where he teaches international law and human rights. He is Chair of the European Human Rights Advocacy Centre (EHRAC), taking cases to the European Court of Human Rights; is President of the European Lawyers for Democracy and Human Rights (ELDH); is active in the Bar Human Rights Committee of England and Wales; and is a Trustee of the Redress Trust, and of Lawyers for Palestinian Human Rights (LPHR).
Bill is presently writing several articles and book chapters on Russia, minority and language rights; the relationship between the Constitutional Court and the European Court of Human Rights; and the Eurasian Economic Union.