Center for Astrophysics
ITAMP Postdoctoral Fellow
Smithsonian Research Associate
Astrophysicist
Postdoctoral Research Fellow
Director of the Institute for Theoretical Atomic Molecular and Optical Physics (ITAMP) SAO Senior Scientist Harvard Senior Research Fellow
Director, Science Education Department
Instrument Scientist
Research Assistant
Phillips Professor of Astronomy, Director Origins of Life Initiative, Senior Advisor in the Sciences for Advanced Study