Yūji Iwasawa has held several influential positions within the international legal community, reflecting his deep expertise and longstanding commitment to the development of international law. His service in international judicial bodies has involved adjudicating complex cases concerning state responsibility, treaty interpretation, and human rights obligations. Through these roles, he has contributed to strengthening the authority of international legal institutions and promoting consistency in the application of international legal norms. His work demonstrates a careful balance between legal tradition and the evolving needs of the global order, ensuring that judicial decisions remain principled, impartial, and firmly grounded in law. Beyond adjudication, his appointments have required extensive engagement with diverse legal systems and cultures, reinforcing dialogue and mutual understanding among states. These responsibilities have positioned him as a respected voice in addressing contemporary legal challenges, including the protection of fundamental rights, peaceful dispute resolution, and the rule of law at the international level.