Daniel Kleppner

Daniel Kleppner was an American physicist renowned for his pioneering work in atomic physics, including the co-invention of the hydrogen maser atomic clock with Norman Ramsey in 1960 and advancements in Rydberg atoms, cavity quantum electrodynamics, and Bose-Einstein condensation.[2][3][4] He served as the Lester Wolfe Professor Emeritus of Physics at MIT, co-founded the MIT-Harvard Center for Ultracold Atoms, and co-authored the textbook *An Introduction to Mechanics* with Robert J. Kolenkow.[2][4] Kleppner earned his Ph.D. from Harvard in 1959 and joined MIT in 1966, retiring in 2003 after shaping modern atomic, molecular, and optical physics.[1][3]