Jennifer Dionne is an Associate Professor of Materials Science and Engineering at Stanford University and director of its TomKat Center for Sustainable Energy. She is notable for her work on materials science and imaging. Her research focuses on the development of new optical materials and microscopy technologies to observe chemical and biological processes as they unfold with nanometer scale resolution. The results of her research help improve energy-relevant processes (such as photocatalysis and energy storage) and medical diagnostics and therapeutics.