Of Stanley's life we have only his own account, which he called The Life and Adventures of the American Cowboy, by Clark Stanley Better Known as the Rattlesnake King, a slim volume that functioned both as an autobiography and advertising brochure. By his account he was born in central Texas in the 1850s and hit the cattle trail at age fourteen. After more than a decade as a cowboy, he was invited one day to visit the Hopi Indians to witness their secret snake dance. Befriending the medicine man, who was impressed with Stanley's Colt revolver and “fancy shooting,” he was invited to live with the Indians and learn their secrets, including, most precious of all, “the secret of snake oil” that was entrusted to him alone.

Tim Wu, The Attention Merchants, loc. 87