The international legal community is mourning Professor Göran Sluiter, a leading scholar of international and comparative criminal law and procedure, who has died at 55 after a battle with cancer.

Sluiter spent his career as a professor at the University of Amsterdam. His scholarship combined insights from domestic criminal law, regional human rights law, and international criminal law — a synthesis that shaped how practitioners and academics approach the prosecution of international offenses before domestic courts and the harmonization and diversity of procedural mechanisms across regional and international tribunals.

Colleagues describe him as among the most knowledgeable scholars on hybridity in criminal procedure. He moved between two worlds with unusual fluency: he brought scholarly insights to his work as a practicing lawyer, then reimported insights from legal practice to sharpen the impact and relevance of his academic writing.

His written legacy is substantial. His many books and articles, colleagues note, carry an influence that survives him.

Two landmark systematization projects

Beyond his publications, Sluiter wielded influence through major research projects that brought together young and established scholars from across the globe.

One project produced an unprecedented systematization of principles of international criminal procedure, resulting in the volume International Criminal Procedure: Principles and Rules, published by Oxford University Press.

A second project, on the systematization of principles of secondary liability in domestic, regional, and international systems, concluded shortly before his death. Its results will appear in a forthcoming volume from Cambridge University Press. Sluiter directed the project despite his cancer diagnosis. He did not live to see its final publication, but colleagues say his influence, work, and spirit will appear on every page of a book that should be widely read.

These were two projects among many academic endeavors he sponsored or created during a career cut short. The guiding force behind both, according to those who worked with him, was his bold and refined vision for international scholarship.

A builder of the profession

Sluiter's influence extended well beyond citation counts. Through conferences he organized, he introduced generations of early-career researchers to the global community of international law — not only scholars, but practicing lawyers, judges, and diplomats.

Colleagues who attended those events as unknown post-doctoral researchers or first-year assistant professors two decades ago now lead the field. Even students who attended those conferences have become the scholars and lawyers shaping international criminal law today.

That story is not unique to any one individual. Sluiter was responsible for launching the professional lives of hundreds of young master's and doctoral students, post-doctoral associates, and other young researchers.

His death, far too soon, is a loss for many of them. But his publications endure, and his intellectual influence continues through the scholars he trained and the collaborative projects he built.

A unique scholar among us has passed, one colleague observed — but his voice has not fallen silent.