Angel De Cora Dietz (1871–1919) was a Winnebago painter, illustrator, Native American rights advocate, and teacher at Carlisle Indian School.

'"[4] As granddaughter to the chief of the Winnebago tribe, De Cora existed in a position of influence since "among most plains people, power and cultural knowledge were accumulated by and dispensed through females"[5] (35).

Under the influence of such precepts and customs, I acquired the general bearing of a well-counseled Indian child, rather reserved, respectful, and mild in manner.

"[6] Taken from her family and placed into the Hampton Normal and Agricultural Institute, Angel de Cora was to accomplish the U.S. federal government's vision of "educating Indian girls in the hope that women trained as good housewives would help their mates assimilate" into U.S. mainstream culture (272).

"[10] Despite knowing that as a woman and as a Native American, De Cora faced more challenges in enjoying success than her peers, Pyle's belief in her was so strong that he still provided her with contacts at magazines and encouraged her to illustrate and compose her own semi-autobiographical stories, "The Sick Child" and "Gray Wolf's Daughter," which were later published in the February and November 1899 issues of Harper's Monthly.

[10] When De Cora left Philadelphia, she went to Boston and enrolled at the Cowles Art School to study life drawing under the tutelage of Joseph DeCamp.

[10] De Cora was married to William Henry "Lone Star" Dietz (Wicarhpi Isnala), who claimed Dakota and German descent but his true background remains partially inconclusive.

"[13] In her tonalist art work, De Cora painted firelight to illuminate warm memories of her childhood life on the Nebraska plains after she settled far from home in the east".

[14] Her oil Painting, "for an Indian school exhibit, for the Pan-American Exposition in Buffalo, New York"[15] demonstrates the technical prowess and emotional depth of her art.

[13] De Cora created the title-page designs for Natalie Curtis's The Indians' Book, a collection of Native American songs, stories, and artwork first published in 1907.

The 1911 Yellow Star: A Story of East West, by Elaine Goodale Eastman features illustrations by De Cora and her husband, William Henry Dietz.

'"[17] At the age of 47, Angel De Cora developed influenza and pneumonia while staying at a friend's home in Northampton, and ultimately died in the Cooley Dickinson Hospital on 6 February 1919.