In 2006 he was "the UN correspondent in Geneva for the French newspaper Libération and the Swiss daily Le Temps, positions he has held since 1992. In this position, he has covered many international crises including those in Afghanistan, the Balkans, the Great Lakes region of Africa, the Ingushetia–Chechen border, the Middle East, Somalia, and the Sudan. Hazan is also an academic researcher for the Swiss National Scientific Foundation on International Criminal Justice at Geneva University (2003–present).
"He has produced four television documentaries with the Franco-German channel ARTE and Swiss Public Broadcasting TV; these documentaries explored such subjects as the International Criminal Tribunal for Rwanda (Rwanda: Justice Taken Hostage, 2003) and universal jurisdiction (The Hunt for Dictators, nominated for the Pierre-Alain Donnier prize for TV documentary at the 18th North–South Film Festival, 2001). Hazan is also one of the founding members of the International Film Festival on Human Rights in Geneva, for which he was a special adviser in 2003 and 2004. He has also organized international conferences on “International Justice, A Reality Check” (Geneva, 2001) and “Reparations: Reconciliation or Political Confrontation?” (Geneva, 2002) in collaboration with UNESCO." 
"He was a senior fellow at the United States Institute of Peace, in Washington DC (2006-2007) and a fellow at Harvard Law School (2005-2006). Mr. Hazan has published extensively on topics related to conflict and transitional justice. Among his most recent books is “Judging War, Judging History” ("Juger la guerre, juger l’histoire”) for which he received the 2008 Georges Dreyfus Prize." 
- Senior Fellow, Jennings Randolph Fellowship Program, USIP, October 2005 – July 2006
- Morocco: Betting on a Truth and Reconciliation Commission Special Report, July 2006
- Justice in a Time of War, The True Story Behind the International Criminal Tribunal for Former Yugoslavia (2004). (foreword by M. Cherif Bassiouni)
- Victim's Guide to the International Criminal Court, in English, Spanish, and French (June 2003).
- Le Mal Suisse, The Swiss Malaise, in French (1998). (Coauthor Yaël Reinharz Hazan)