Ramnik Xavier is a core institute member of the Broad Institute of MIT and Harvard, where he serves as director of the Klarman Cell Observatory. He is also director of the Broad’s Immunology Program and co-director of the Broad’s Infectious Disease and Microbiome Program. He is the Kurt Isselbacher Professor of Medicine at Harvard Medical School; director of the Center for Computational and Integrative Biology and member of the Department of Molecular Biology at Massachusetts General Hospital (MGH); and co-director of the Center for Microbiome Informatics and Therapeutics at MIT.