Daniel Kleppner, a renowned physicist who made significant contributions to atomic physics and quantum computing, passed away on June 16, 2025, at the age of 92. He was best known for his work on hydrogen masers, which laid the groundwork for the Global Positioning System (GPS), and his pioneering research on Rydberg atoms and Bose-Einstein condensation. Kleppner spent nearly four decades as a professor at the Massachusetts Institute of Technology (MIT) and received the National Medal of Science in 2006. His final words were a toast to the future of science at his grandson's high school graduation party.
