The 2026 Ray A. and Robert L. Kroc Lecture at Uppsala University, Sweden, was delivered by Professor Decio L. Eizirik, UCDR. The Kroc Lecture is an annual distinguished lecture established through a donation from the Ray A. and Robert L. Kroc Foundation. It is intended to bring internationally recognized leaders in diabetes research to Uppsala. Given the prestige of the series, being selected as the 2026 Kroc Lecturer is a significant international recognition for contributions to β-cell biology and type 1 diabetes research.