 Following her Ph.D. work at Princeton, Hastings became a postdoctoral fellow at the University of Washington in the Joint Institute for the Study of the Atmosphere and Ocean Department of Atmospheric Sciences (JISAO).After completing her postdoctoral work in 2008, Hastings joined the faculty at Brown University as an assistant professor in the Department of Geological Sciences and Environmental Change Initiative.In 2015, Hastings became an associate professor of Earth, Environmental and Planetary Sciences at Brown University.