Dr. Ranasinghe joined Southern Polytechnic State University now consolidated to Kennesaw State University as an assistant professor of physics in 2007. Before joining she worked at Northern Kentucky University as a lecturer of Physics. She has a research program in the department in which she works with undergraduate students. Her expertise is in the physics of glass science and technology. She is mainly studying the glass structure, thermal analysis, nucleation and crystallization, and bioactive glass.