Henry George (September 2, 1839 – October 29, 1897) was an American writer, politician and political economist, who was the most influential proponent of the land value tax, also known as the "single tax" on land. He inspired the philosophy and economic ideology known as Georgism, which is that everyone owns what he or she creates, but that everything found in nature, most importantly land, belongs equally to all humanity. His most famous work is Progress and Poverty written during 1879; it is a treatise on inequality, the cyclic nature of industrial economies and possible remedies.