Indian-American Radha Iyengar Plumb is the new deputy under-secretary of defence for acquisition and sustainment at the Pentagon, USA. She is currently serving as chief of staff to the deputy secretary of defence. Prior to this, Plumb was the director of research and insights for trust and safety at Google and the global head of policy analysis at Facebook. In both these jobs, she focused on high-risk safety and critical international security issues. Plumb has a PhD and MS in economics from Princeton University and holds a BS from the Massachusetts Institute of Technology (MIT). She is known for her skills in policy research, econometrics, trust and safety issues and project management.