American author of The Jungle, which exposed the unsanitary conditions of the meat-packing industry and the torturous treatment given to those who worked there.
He entered City College of New York five days before his fourteenth birthday and would write dime store novels, jokes, and magazine articles to pay for his tuition.
Many of the experiences detailed in the book The Jungle were taken from Sinclair's actual life, as he once worked for the meat-packing industry.
Had a son, David, with his first wife Meta Fuller who later left him for Harry Kemp.
He once worked with silent film star, Charlie Chaplin.