Research Interests

The central thrust of my physics research is to test the most fundamental symmetries of nature using low energy methods. A single electron, suspended in our apparatus for months at a time and cooled to 100 mK, is used to measure the electron magnetic moment to 3 parts in 10^{13} -- an accuracy 15 times higher than realized in earlier experiments. This measurement and QED theory determines the fine structure constant to 4 parts in 10^{10} -- about 20 times more accurately than any rival method. A single suspended antiproton was used to show that the proton and its antimatter counterpart have the same charge-to-mass ratio (but with opposite sign) to about 1 part in 10^{10}. Our antimatter studies developed the methods to produce and study antihydrogen atoms. We hope to eventually compare to hydrogen atoms using extremely precise laser spectroscopy.

Membership Type


Election Year


Primary Section

Section 13: Physics

Secondary Section

Section 33: Applied Physical Sciences