Fred Ramsdell American biologist Fred Ramsdell was jointly awarded the 2025 Nobel Prize for Physiology or Medicine for his work in peripheral tolerance. (more) Fred Ramsdell American biologist Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/biography/Fred-Ramsdell Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction Spelling/Grammar Correction Link Correction Additional Information Other Your Feedback Submit Feedback Thank you for your feedback Our editors will review what you’ve submitted and determine whether to revise the article.

　　External Websites Ask the Chatbot a Question Also known as: Frederick J. Ramsdell Written by Written by The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... The Editors of Encyclopaedia Britannica Last Updated: Oct. 7, 2025 •Article History Table of Contents Table of Contents Ask the Chatbot Fred Ramsdell (born December 4, 1960, Elmhurst, Illinois, U.S.) is an American biologist who was awarded the 2025 Nobel Prize for Physiology or Medicine for his work on the immune system. He shared the prize with American biologist Mary E. Brunkow and Japanese immunologist Shimon Sakaguchi. Ramsdell received a doctorate in microbiology and immunology from the University of California, Los Angeles. When he received the Nobel Prize, he was a scientific adviser for Sonoma Biotherapeutics...

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