Creator of the Post brand cereals Grape Nuts, Corn Flakes, and others.
He attended Illinois Industrial University but did not graduate. Before making his fortune, he tried farming and real estate, but left because of stress and overwork.
He opposed the trade union movement and was not fondly remembered by the National Association of Manufacturers.
He was married to Leila Young from 1904 until his death in 1914. He had one daughter,
He grew up in Springfield, Illinois, the same town where then-president Abraham Lincoln spent his boyhood.