Kirby held a postdoctoral research position at
Harvard College Observatory and then became a research physicist at the
Smithsonian Astrophysical Observatory in Cambridge, Massachusetts. She served as the associate director for the
Center for Astrophysics Harvard & Smithsonian, heading the Atomic and Molecular Physics Division from 1989 until 2001. She was the director of the
National-Science-Foundation-funded
Institute for Theoretical Atomic, Molecular and Optical Physics (ITAMP) at
Center for Astrophysics Harvard & Smithsonian from 2001 to 2007. Kirby was named as the executive officer of the
American Physical Society (APS) in May 2009, a position she began in July of the same year, replacing
Judy Franz. On assuming the role, Kirby said "Having served the Society for well over two decades as a volunteer on a number of committees, the Council and Executive Board, I am excited to be joining the APS leadership team." She added, "I look forward to working with APS staff and the membership to advocate for physics in the public arena and to serve the community of physicists throughout the U.S. and the world." Kirby became the American Physical Society's chief executive officer in 2015 after a restructuring of the organization. She served as the chief officer of APS till 2021. Kirby has been an active partner with the American Association for the Advancement of Science (AAAS). == American Physical Society ==