Stefan Ulmer (born 1977 in Tübingen) is a particle physicist, professor of Physics at Heinrich Heine University Düsseldorf and chief scientist at the Ulmer Fundamental Symmetries Laboratory, RIKEN, Tokyo. He is the founder and the spokesperson of the BASE experiment (AD-8) at the Antiproton Decelerator facility at CERN, Geneva. Stefan Ulmer is well known for his contributions to improving Penning trap techniques and precision measurements on antimatter. He is the first person to observe spin transitions with a single trapped proton as well as single spin transitions with a single trapped antiproton, a significant achievement towards a precision measurement of the antiproton magnetic moment. Stefan Ulmer completed his Ph.D. thesis from the Heidelberg University, Germany, under the supervision Wolfgang Quint and Klaus Blaum in 2011. Ulmer's studies focused on the first observation of spin flips with a single proton stored in a cryogenic Penning trap. In 2012 he was promoted to a PI position at RIKEN, Japan, and in 2019 he became co-director of a MPG, RIKEN, PTB center for time, constants, and fundamental symmetries. Source: Wikipedia (en)