Did Yukio Mishima and Noah Gordon have pen names?
no
Title: Persona: A Biography of Yukio Mishima
Passage: Persona: A Biography of Yukio Mishima is a 2012 biography of Yukio Mishima written by Naoki Inose with Hiroaki Sato, and published by Stone Bridge Press.  It is an expanded adaptation in English of Inose's 1995 Mishima biography, "Persona: Mishima Yukio den", published by Bungeishunjū in Tokyo, Japan.
Title: Noah Gordon (novelist)
Passage: Noah Gordon (born November 11, 1926) is an American novelist.  He was born in Worcester, Massachusetts.
Title: Yukio Mishima
Passage: Yukio Mishima (三島 由紀夫 , Mishima Yukio ) is the pen name of Kimitake Hiraoka (平岡 公威 , Hiraoka Kimitake , January 14, 1925November 25, 1970) , a Japanese author, poet, playwright, actor, and film director.  Mishima is considered one of the most important Japanese authors of the 20th century.  He was considered for the Nobel Prize in Literature in 1968 but the award went to his countryman Yasunari Kawabata.  His works include the novels "Confessions of a Mask" and "The Temple of the Golden Pavilion", and the autobiographical essay "Sun and Steel".  His avant-garde work displayed a blending of modern and traditional aesthetics that broke cultural boundaries, with a focus on sexuality, death, and political change.  Mishima was active as a nationalist and founded his own right-wing militia, the Tatenokai.  In 1970, he and three other members of his militia staged an attempted "coup d'état" when they seized control of a Japanese military base and took the commander hostage, then tried and failed to inspire a coup to restore the Emperor's pre-war powers.  Mishima then committed ritual suicide by "seppuku".  The coup attempt became known as the "Mishima Incident".
Yukio Mishima Noah Gordon (novelist)