He by far has the widest reaching epic I've encounter. His creation of the cosmere is something that I couldn't even imagine doing with fiction. The Elantris series, the Stormlight Archives, the Mistborn Series, The Warbreaker series. The idea that in some way all of these worlds are connected, and somehow share elements is unbelievable. When Sanderson finishes his work the Cosmere is going to be the largest epic collection of all time.