There are two versions of the Oh Henry! bar origin story. The manufacturer Nestlé says that the bar was introduced by George Williamson and his Williamson Candy Company of Chicago in 1920. The alternate story is that Thomas Henry, manager of the Peerless Candy Co. in Arkansas City, Kansas, invented a bar he called the "Tom Henry Bar" in the late 1910s, and sold the recipe to George Williamson in 1920.