The criterion for election is exceptional contributions to the physics enterprise; e.g., outstanding physics research, important applications of physics, leadership in or service to physics, or significant contributions to physics education. Fellowship is a distinct honor signifying recognition by one's professional peers.
For outstanding scientific leadership in the development of a state-of-the-art optical lattice clock to achieve one of the lowest atomic clock systematic uncertainties ever recorded, and for innovative technologies associated with optical clock comparison, transportable clocks, and stable lasers.