We are deeply saddened to share the news of Prof. Frans Claas’s unexpected passing. His contributions to histocompatibility and immunology significantly advanced our understanding of organ transplantation, leaving a lasting impact on science and the community.

Beyond his groundbreaking work, Frans was an inspirational mentor and a genuinely kind person. His enthusiasm, generosity, and dedication influenced us all.

On behalf of ESOT, we extend our condolences to his family, friends, and all who knew and worked with him.