Professor Ann Nelson was backpacking with friends and family in the Alpine Lakes Wilderness when she slipped and fell down a steep gully.
Professor Nelson was a renowned theoretical physicist who specialized in elementary particle physics, and had been at the University of Washington since 1994. She was a member of the National Academy of Sciences and the American Academy of Arts and Sciences, and was a recipient of the J.J. Sakurai prize for theoretical particle physics. She was also a passionate advocate for inclusion and diversity in Physics, penning this article in Physics Today. She is survived by her husband, David B. Kaplan and two children, as well as siblings and other family. Her legacy also includes many former students, postdocs, and collaborators throughout the world. She will be greatly missed.