Jeffrey I. Gordon, MD, directs the Washington University School of Medicine’s Center for Genome Sciences and Systems Biology. Along with talented students and colleagues, Gordon has harnessed the power of specialized mouse models to study the ­microbial communities that colonize the human gut. (James Byard/Washington University)

The father of the microbiome

Jeffrey I. Gordon, MD, is expanding our understanding of human health into nonhuman realms, studying the bacteria that take up residence in the gut and help define who we become. Indeed, this research suggests you are what you — and your microbes — eat.