Justin Sonnenburg, PhD, is the Alex and Susie Algard Endowed Professor in the Department of Microbiology and Immunology at the Stanford University School of Medicine, where he studies the gut microbiota in health and disease and co-directs the Center for Human Microbiome Studies. He has received an NIH Director’s New Innovator Award and Pioneer Award, the AGA Research Mentor Award, and co-founded Interface Biosciences. He and his wife and collaborator, Erica, are the authors of the book The Good Gut: Taking Control of Your Weight, Your Mood, and Your Long-Term Health.