He was a visiting scholar to the Pritzker School of Law, Chicago from May to June 2001, a visiting professor of Human Rights and Democratization in Africa to the Center for Human Rights at the University of Pretoria from March to April 2001, a visiting scholar at the Queens University of Belfast, Northern Ireland, United Kingdom in March 2000 and at the Faculty of Law of the University of Leiden, Netherlands from August to September 1999, and a visiting professor at the College of Law, Stetson University, Florida USA in 1997.