Mary Brunkow

Mary Brunkow is a 2025 Nobel Laureate in Physiology or Medicine whose foundational work on the FOXP3 gene transformed the scientific understanding of how the immune system regulates itself. A molecular biologist and geneticist trained at the University of Washington and Princeton University, where she earned her PhD in molecular biology under renowned geneticist Dr. Shirley M. Tilghman, Brunkow built her career at the intersection of discovery science and translational medicine in the Seattle biotech ecosystem.

Nobel Prize speaker Mary Brunkow is best known for co-identifying FOXP3 — the master regulatory gene that controls the development and function of regulatory T cells, the immune system’s internal “off switch.” Working alongside colleagues at Darwin Molecular Corporation and later Celltech in Bothell, Washington, Brunkow and Fred Ramsdell began investigating a mutant mouse strain called “scurfy,” which suffered from a severe, fatal immune disorder. Through years of meticulous genetic mapping and sequencing, they pinpointed a two-base-pair mutation in a previously unknown gene — work that answered a century-old riddle in immunology. Their landmark findings, published in three seminal papers in Nature Genetics in 2001, not only named and characterized FOXP3 but also connected mutations in the human equivalent of the gene to IPEX syndrome, a life-threatening autoimmune disorder.

The Discovery That Redefined Immunology

Brunkow’s FOXP3 research became the molecular keystone for an entirely new field in peripheral immune tolerance. When Shimon Sakaguchi later proved that the same gene governs the regulatory T cells he had discovered in 1995, the combined body of work revealed the biological mechanism preventing the immune system from attacking the body’s own tissues. This breakthrough opened three major therapeutic frontiers: designing immunotherapies that suppress regulatory T cells to unleash immune attacks on tumors; developing Treg-based treatments to curb autoimmune disease flares; and advancing protocols for more successful organ and stem cell transplantation. Brunkow is currently a Distinguished Investigator at the Institute for Systems Biology in Seattle, where she continues contributing to multidisciplinary research in immunology, genomics, and systems biology through ISB’s Hood Lab. Her Nobel Prize coverage spanned The New York Times, The Washington Post, The Wall Street Journal, and NPR.

As a speaker, Mary Brunkow brings a rare combination of scientific depth and genuine human storytelling to the stage. She takes audiences inside one of the most consequential discoveries in modern medicine — beginning with a puzzling mutant mouse and ending with Nobel-recognized insights that now guide cancer immunotherapy, autoimmune treatment, and transplant science worldwide. For healthcare, biotech, research, and leadership audiences, her talks offer a masterclass in how curiosity, persistence, and collaborative science drive breakthroughs that reshape entire fields. Brunkow’s story is also a powerful reminder that transformative discoveries often happen outside the spotlight — a message that resonates deeply with organizations navigating innovation and long-horizon thinking.