Muon g-2 Ernst Sichtermann, Lawrence Berkeley National Laboratory

The magnetic moments and g-values of particles have played important roles in the development of modern physics. The Muon g-2 Collaboration has measured the anomalous magnetic moment of the positive muon to a relative uncertainty of 0.7 parts per million.  At this level of uncertainty the measurement is sensitive to all Standard Model interactions and places stringent constraints on speculative extensions. I will describe the experiment, will present a new result for the negative muon, and will discuss prospects for the future.