Theodora McCormick was born on September 14, 1890 in Brooklyn, New York. Her father died when she was a year old and she was raised by her mother and stepfather. She attended the Barnard School for Girls in Manhattan and the Halsted School in Yonkers. Although she wanted to attend Vassar College and was accepted in 1909, her parents did not support her attending the school. Her plans to go anyway were dashed when she was diagnosed with tuberculosis and she found herself in a TB sanitarium instead. Eventually, in 1916, she enrolled in the Dartmouth Summer School for Drama.

While in the sanitarium, McCormick began writing poetry, although most of her poetry was written during this time and after she was healthy she focused on various forms of prose writing. In 1918, she married Delafield Du Bois and took the name Theodora Du Bois. Theodora gave birth to a daughter, also named Theodora, in 1919 and in 1922 had a son, Eliot.

Perhaps best known as a playwright and mystery author, she wrote historical romances using the name Theodora McCormick, and other works of fiction and plays as by Theodora Du Bois. Her first published play, The Sleeping Beauty: A Play With or Without Pageantry, was first published in 1919 and, as the name implies, is a fantasy. Her first book, Amateur and Educational Dramatics was written with coauthors Evelyne Hilliard and Kate Oglebay and was published in 1917.

She began publishing fiction in 1920 with the short story “Thursday and the King and Queen,” which appeared in Woman’s Home Companion. She branched out to novels in 1930 with The Devil’s Spoon about a devil who possesses a human in order to fight against Satan’s plans to dominate the world (originally published as a novel, it would be reprinted in the June 1948 issue of Famous Fantastic Mysteries). Du Bois would return to the theme of possession in 1948 with The Devil and Destiny.

Later works, such as Murder Strikes and Atomic Unit and High Tension fell into the science fiction/thriller genre and other works during the 1940s and 50s also tackled the cold war, with Du Bois being dropped by her publisher in 1954 after her novel Seeing Red took on the issue of McCarthyism.

In addition to her dramas, mystery novels, historical romances, and science fiction works, Du Bois also wrote numerous juvenile works, beginning with Rocks and Rills: A Cartoon in Three Dimensions in 1932 through The High King’s Daughter in 1966.

When Delafield Du Bois worked on the Manhattan Project during World War II, the couple formed a committee at Yale University to help academics from Oxford and Cambridge who found themselves in the United States  during the war. Delafield died in 1965.

Titles published using the McCormick name included the medieval novel The Emerald Crown, the American Revolution novel Freedom’s Way, and the Irish novel The Love of Fingin O’Lea.

Du Bois died on February 1, 1986 in New York. She is buried in Moravian Cemetery in New Dorp, New York.

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Steven H Silver is a twenty-one-time Hugo Award nominee and was the publisher of the Hugo-nominated fanzine Argentus as well as the editor and publisher of ISFiC Press for eight years. He has also edited books for DAW, NESFA Press, and ZNB. His most recent anthology is Alternate Peace and his novel After Hastings was published in 2020. Steven has chaired the first Midwest Construction, Windycon three times, and the SFWA Nebula Conference numerous times. He was programming chair for Chicon 2000 and Vice Chair of Chicon 7.