Her research group applies interdisciplinary approaches to study pollutants in indoor and outdoor air. She is especially interested in emerging or non-traditional aerosols such as engineered nanomaterials and viruses and how they can be physically and chemically transformed in the environment. Marr is a recipient of an NSF CAREER award and an NIH New Innovator award. She is a Fellow of the International Society of Indoor Air Quality and Climate. In 2020, she was appointed to the US National Academies’ Board on Environmental Science and Toxicology. Marr received a B.S. in Engineering Science from Harvard College and a Ph.D. in Civil and Environmental Engineering from the University of California at Berkeley and completed her post-doctoral training in Earth, Atmospheric, and Planetary Sciences at the Massachusetts Institute of Technology.