Mark McAfee is a fifth generation farmer, owning and operating Raw Farm, the largest raw dairy operation in the world. He works to offer raw dairy products intended for human consumption, advocating for their non-allergenic, digestible, and probiotic properties. He is the Chairman of the Raw Milk Institute, founded in 2012, which seeks to improve the safety and quality of raw milk products. He is committed to promoting the health benefits of raw dairy products and maintaining sustainable farming practices, making him one of the foremost leaders in the field. Off the farm, he lectures on the gut biome benefits of raw milk at Stanford, University of Southern California, and medical schools in the United States, Australia, and Canada.