Heȟáka Sápa (Black Elk) (December 1863 – August 19, 1950) was a famous wičháša wakȟáŋ (medicine man and holy man) of the Oglala Lakota (Sioux). He was Heyoka and a second cousin of Crazy Horse.
Since the 1970s the book Black Elk Speaks has become an important source for studying Native spirituality, sparking a renewal of interest in Native religions. Black Elk worked with John Neihardt to give a first-hand account of his experiences and that of the Lakota people. His son Ben would translate Black Elk's stories, which were then recorded by Neihardt's daughter Enid, who would then put them in chronological order for Neihardt's use. Within the American Indian Movement Black Elk Speaks became an important source for those seeking religious and spiritual inspiration. They also sought Black Elk nephew and medicine man, Frank Fools Crow, for information on Native traditions.
(from Wikipedia)