He served, along with Javier Martínez-Torrón of Complutense University of Madrid, as a General Rapporteur for the topic "Religion and the Secular State"[7] at the 18th International Congress of Comparative Law, held in Washington, D.C., in July 2010.

He has worked on constitutional and statutory drafting projects throughout Eastern Europe and in most former Soviet bloc countries.

He served for many years as a member of the Organization for Security and Co-operation in Europe/Office for Democratic Institutions and Human Rights’s Advisory Council on Freedom of Religion or Belief.

Durham has played a role in advising governments throughout much of the former socialist bloc on constitutional provisions and legislation dealing with criminal law and procedure, court structure, general constitutional issues, and the law of associations, including particularly religious associations.

This has included consultations on constitutional issues and laws in Albania, Argentina, Armenia, Azerbaijan, Bosnia and Herzegovina, Bulgaria, Chile, China, Croatia, the Czech Republic, Dominican Republic, Estonia, France, Georgia, Hungary, Indonesia, Iraq, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Macedonia, Moldova, Mexico, Nepal, Nigeria, Peru, Romania, Russia, Rwanda, Samoa, Serbia, Slovakia, Slovenia, Tajikistan, Thailand, Ukraine, and Vietnam.

[17] In June 2011, Durham and his colleagues at the International Center for Law and Religion Studies filed an amicus brief[18] in the U.S. Supreme Court case concerning the hiring practices of a Lutheran church school.