Dan Littman’s laboratory has made multiple contributions towards our understanding of mechanisms that promote immune system development and contribution to physiological homeostasis, particularly through interactions with microbiota and with cells of the peripheral and central nervous systems. He received Ph.D. and M.D. degrees from Washington University in St. Louis, and was Professor of Microbiology and Immunology at the University of California, San Francisco, before joining NYU, where he is the Kimmel Professor of Molecular Immunology at the Skirball Institute and an Investigator of the Howard Hughes Medical Institute. Dr. Littman is a member of the U.S. National Academy of Sciences, the National Academy of Medicine, and the American Academy of Arts and Sciences, past president of the American Association of Immunologists, and recipient of several scientific awards, including the Ross Prize in Molecular Medicine and the Vilcek Prize in Biomedical Sciences.