She is a theoretical astrophysicist interested in cosmology, gravitational lensing and black hole physics. Her research involves mapping the detailed distribution of dark matter in the universe exploiting the bending of light en-route to us from distant galaxies. In particular, she has focused on making dark matter maps of clusters of galaxies, the largest known repositories of dark matter and use them to probe the elusive nature of dark matter. Gravitational lensing by clusters can also be utilized to constrain dark energy models, including evolving ones and she has been developing the methodology and techniques to do so. Her work has demonstrated that lensing permits the use of clusters of galaxies as a unique and powerful astrophysical laboratory.