Nice has been active in the International Criminal Court (ICC) and in pro bono work for victims groups.

[9] In August 2010, journalist Judith Armatta published a book titled Twilight of Impunity: The War Crimes Trial of Slobodan Milosevic.

[10] Nice alleged that the prosecutor of the ICTY, Carla Del Ponte, had compromised with Milosevic, which then led to a failure of Bosnia-Herzegovina in their genocide case against Serbia in February 2007.

The tribunal focused on the issue of forced organ harvesting from prisoners of conscience in China and delivered its Final Judgment in January 2020.

In 2021, in retaliation for sanctions issued against Chinese officials by the United States, European Union and United Kingdom, the People's Republic of China issued sanctions against Nice that banned him from entering territory that the country controls or from doing business with Chinese persons.

It aims to promote a multidisciplinary approach to the study and teaching of International Criminal Justice and uses methodologies from law, history, sociology, political science, and international relations to address issues related to political violence and mass atrocities.

In 2009, a conviction Nice had presided over was ordered quashed and retried, after a Privy Council Appeal found his handling of the case had resulted in an unfair hearing.

[18] One reason that Nice was criticized by the Privy Council for his was his unfair handling in the trial of a St. Helier-based accountant Peter Michel.