Gregory F. Sonnenberg is Assistant Professor of Microbiology and Immunology in Medicine at Weill Cornell Medical College, Cornell University, New York City. He received his undergraduate degree in 2007 from the State University of New York at Buffalo and earned his Ph.D. in 2011 from the University of Pennsylvania. Sonnenberg studies how interactions between the mammalian immune system and commensal bacteria can regulate health and disease in the gastrointestinal tract. The main goals of his lab are to interrogate the pathways that regulate normally beneficial host interactions with commensal bacteria; to determine how these pathways become disrupted in chronic human diseases; and to identify novel therapeutic targets to prevent or limit dysregulated host-commensal bacteria relationships in human disease. His current focus is on recently identified populations of intestinal-resident innate lymphoid cells (ILCs), which have been found to be critical regulators of cytokine-mediated intestinal epithelial cell responses that promote immunity to extracellular bacteria, inflammation, and tissue repair in the intestine.