John Harvey Kellogg (February 26, 1852 - December 14, 1943) was a physician, health reformer, and nutritionist who led a revolution in health awareness during his lifetime. Kellogg was born in Tyrone Township, Michigan, the son of a small-town blacksmith and gardener. He was educated at Bennett Medical College in Chicago, where he trained to become a physician. Afterward, he was hired at the Battle Creek Sanitarium as the in-house physician, founded a medical journal (the Battle Creek Medical Journal), and went on to become the Superintendent and later the President of the Sanitarium. Kellogg’s major contribution to health reform came in the form of his influence in dietary theory. As Superintendent of the Sanitarium, he advocated for the use of natural, plant-based foods like cereal and nuts, rather than more processed foods like meats and dairy. He worked with his brother, Will, to develop a variety ofhygienically-processed cereal grains, and the two later went on to found the Kellogg Company. During his career, Kellogg published over 100 books and pamphlets about nutritional and health-related topics, in an effort to educate the public on natural and healthy eating habits. A formidable proponent of preventative health, Kellogg developed the ideas of biologic living and believed the body needed to be nurtured through good nutrition, exercise, and other hygienic practices in order to remain in optimal health. His tireless work in health and nutrition educated a nation of Americans on the importance of these principles, influencing the way millions of people ate and lived throughout his lifetime. John Harvey Kellogg died at the age of 91 on December 14, 1943 in Battle Creek, Michigan. He left behind a legacy of change and education in the field of health and nutrition that is still felt today.