Which authors share a birthday with Kathy Tyers?

Alfred Arthur Greenwood Hales (21 July 1860 - 29 December 1936), the Australian novelist and war correspondent

John Graham of Claverhouse, 1st Viscount Dundee (c.1648 - July 27, 1689) belonged to a family that, descended from King Robert III and had acquired the estate of Claverhouse near Dundee, Scotland

Frances Parkinson Keyes (July 21, 1885 - July 3, 1970), the American author, and a convert to Roman Catholicism, whose works frequently featured Catholic themes and beliefs

Guglielmo Ferrero (July 21, 1871 — August 3, 1942), the Italian historian, journalist and novelist, author of the Greatness and Decline of Rome (6 vols., 1903-1908)

Chuck Stone (born July 21, 1924), the American newspaper editor, columnist, and professor of journalism

David or Davyd Burliuk (July 21, 1882–January 15, 1967), the Ukrainian avant-garde artist (Futurist, Neo-Primitivist), book illustrator, publicist, and author associated with Russian Futurism

John Brendan Keane (July 21, 1928-May 30, 2002), the Irish playwright, novelist and essayist from Listowel, County Kerry

John Weaver (July 21, 1673 - September 24, 1760), the dancer and choreographer and is commonly known as the father of English pantomime

Yann-Ber Kalloc'h (b.Jean-Pierre Calloc'h in French) (21 July 1888 in the island of Groix - d. 10 April 1917 in Urvillers (Aisne) French writer in Breton and FrenchHe, the son of a humble fisher and he became an orphan in 1902

Dr. James Cooke Brown (July 21, 1921 – February 13, 2000), the sociologist and science fiction author

David Feintuch (July 7, 1944-March 16, 2006), the science fiction and fantasy author and attorney