Yu was trained as an experimental nuclear physicist and worked primarily in nuclear structure from 1988 to 2011. During this period her research focus had been gamma-ray spectroscopy at high angular momentum, properties of exotic nuclei far from stability, and studies of nuclear structure with radioactive beams. In 2009, Yu joined the Majorana Collaboration, an experiment focusing on searches for neutrinoless double-beta decays in 76Ge. A positive identification of the neutrinoless double beta decay will provide some of the most sort-after information about the neutrino. The Majorana collaboration consists of about 100 physicists from more than 25 institutions worldwide. ORNL has been the lead laboratory for this collaboration. The current experiment is a proof-of-principle “Demonstrator” funded by DOE. The experiment is located in the Sanford Underground Laboratory (4850 feet underground) in Lead, South Dakota. The construction of the Demonstrator experiment has just ended and operation has begun. The experiment is expected to run for about 3-5 years. Yu is also a member of the Legend experiment, a much larger international collaboration searching for neutrinoless double-beta decays using one ton of enriched 76Ge.