Dan Muller

Daniel Cody Muller, generally known as Dan Muller (1889–1976) was a cowboy, an artist, illustrator, and writer of the American West. Having grown up on a ranch, he learned to break in horses, a skill he utilized for the United States Army during World War I. He made and sold paintings of the American Old West and worked occasionally as a ranch hand into the 1920s. In 1933, his first published story was Break 'Em Gentle for Esquire magazine. He wrote and illustrated books, like Chico of the Cross Up Ranch and Horses. He created three large murals for the Chicago World's Fair (Century of Progress) which were awarded a gold medal and a $1,200 cash prize.

Muller was a prolific artist who painted scenes with great detail due to his photographic memory. He married Edna Groeschel while both of them were on horseback in Nevada. The couple moved in 1939 to Port Washington, Wisconsin, where Muller continued to work as a creator and lived the rest of his life.

Muller wrote the book My Life with Buffalo Bill, which sounds autobiographical, but there has been no verification that Muller had the kind of relationship with Cody that he asserts.