Leonardo Nemer Caldeira Brant maintains a sustained and in-depth research focus on public international law, examining both its foundational principles and its application in contemporary international relations. His research addresses the sources of international law, including treaties, customary international law, and general principles of law, with particular attention to how these sources are interpreted by international courts and tribunals. A central theme of his research is international adjudication, encompassing jurisdiction, admissibility, procedural fairness, and the reasoning processes of international judicial bodies. He also explores the doctrine of state responsibility, analyzing the legal consequences of internationally wrongful acts and the mechanisms through which accountability is established at the international level. Judge Brant’s research reflects a balanced approach that integrates legal theory with judicial practice. It seeks to clarify complex legal questions while responding to evolving global challenges, reinforcing the role of international law as a framework for peaceful cooperation and dispute resolution among states.