 Matas served as a Law Clerk to the Chief Justice of Canada in 1968-69, and was a member of the Foreign Ownership Working Group, Government of Canada, and was special assistant to the Solicitor General of Canada in 1971-72.He served as a member of the Canadian delegation to the United Nations General Assembly, the Task Force on Immigration Practices & Procedures, the Canadian delegation to the United Nations Conference on an International Criminal Court 1998, the Canadian Delegation to the Stockholm International Forum on the Holocaust, and from 1997 until 2003, the Director of the International Centre for Human Rights & Democratic Development.On Nov. 13, 2009, Mr. Matas was appointed to the board of this Centre, also known as Rights and Democracy (R&D), which was headed by Professor Aural Braun.