Jeffrey Dean Leach (born 1967 in Boston, Texas, known as Jeff Leach) is an American businessman and microbiome researcher from Texas. He is known for his work on the gut microbiome of the Hadza hunter gatherers, founding the Human Food Project, publishing archeology magazines, deceptive business practices, being accused of sexual assault, and founding the Naked Pizza restaurant chain. Research Leach studied archaeology at the University of Texas and New Mexico State University. In the 1990s, Leach was affiliated to the Center for Archaeological Research at the University of Texas at San Antonio, co-founded the Center for Indigenous Research in El Paso, Texas with Ray Maudlin. He then founded the Paleobiotics lab in New Mexico and collaborated with Kristin Sobolik of the University of Maine. In 2012 he co-founded the Human Food Project and the American Gut Project with Jack Gilbert and Rob Knight, publishing results in 2018. As part of his work on the gut microbiome of the Tanzanian Hadza hunter gatherers he had a fecal transplant from a Hadza man. This was criticized by anthropologist John Hawks and science writer Ed Yong, who said of the idea of inducing a healthy microbiome that "This reasoning is faulty". He was a Visiting Research Fellow at King’s College London. In 2010 he said he was studying for a Ph.D. at the University of Leicester and in 2019 he said he was pursuing a Ph.D. at the University of York. Business In the late 1990s and early 2000s, Leach was the publisher of Discover Archaeology (launched in 1998), Dinosaur Magazine, Egypt Revealed, and Archeology Today. He used Beto O'Rourke's web design company Stanton Street Design. In 2003, a court in Texas found he had sold subscriptions for magazines that had closed and had charged for a tour of the Middle East that did not happen. Details of this civil court case were recently published in Science magazine “Leach was found to have violated laws against deceptive trade practices. The Texas attorney general alleged that Leach had sold subscriptions to magazines that had stopped publishing and had accepted more than $100,000 in payments for a tour in Egypt that was to feature the actor Omar Sharif, but was never organized. Leach failed to contest the claims and the court found them admitted and proven.” In 2001, he was involved with Mike Kammerer in plans to find Amelia Earhart's plane. Leach co-founded Naked