Title: Once a Hero (novel)
Content:  Once a Hero is a science fiction novel by Elizabeth Moon. It is the first of the three books of the Esmay Suiza trilogy in Moon's fictional Familias Regnant universe, following the three of the Heris Serrano trilogy.
Title: Once a Hero
Content:  Once a Hero is an American action-adventure television series that aired on ABC from September 19 until October 3, 1987. The series stars Milo O'Shea as Abner Bevis, a down-on-his-luck comic book artist whose life is turned upside down when his creation, Captain Justice (Jeff Lester), comes to life. Also appearing in the series were Caitlin Clarke and Robert Forster.
Title: Once a Hero (film)
Content: Emerson Treacy ; Betty Grable as Frances Dean ; Jack Shutta 
Title: Once a Hero (film)
Content:  Once a Hero is a 1931 American comedy film directed by Fatty Arbuckle and starring Emerson Treacy.
Title: Once a Hero
Content: Milo O'Shea as Abner Bevis ; Jeff Lester as Captain Justice/Brad Steele ; Robert Forster as Gumshoe ; Caitlin Clarke as Emma Greely ; Josh Blake as Woody Greely ; David Wohl as Edward "Eddie" Kybo 
Title: Hero (novel)
Content:  Hero is a 2007 Lambda-winning novel, and the only novel by openly gay film producer and novelist Perry Moore. The fantasy novel is about a teenage superhero, Thom Creed, who must deal with his ex-superhero father's disgrace, his own sexuality, and a murderer stalking the world's heroes.
Title: Once a Hero (novel)
Content:  Chronologically, Once a Hero directly follows Winning Colors, even overlapping partially, but the focus distinctly shifts to young Esmay Suiza, who came to prominence after successfully leading a mutiny against her traitorous captain and intervening to decisive effect in the Battle of Xavier (as Winning Colors records). Suiza is not immediately praised and feted for her heroism, however, for her actions demand official scrutiny. Thorough and complete, neither the Board of Inquiry nor the court-martial find Suiza guilty of anything, and so she is allowed to take a vacation before her next assignment. Back home on Altiplano, Esmay is honored 
Title: Kate Hoffmann
Content: 1) Once a Hero (1999) ; 2) Always a Hero (1999) 
Title: I Am a Hero
Content:  I Am a Hero, written and illustrated by Kengo Hanazawa, was serialized in Shogakukan's Big Comic Spirits from April 27, 2009 to February 27, 2017. Shogakukan has compiled the chapters into twenty-two tankōbon volumes, released from August 28, 2009 to March 30, 2017. In North America, Dark Horse Comics announced in May 2015 the license to the manga for English language release, with plans for a 2-in-1 omnibus format release starting in 2016. The first volume was published on April 13, 2016. The eleventh and final volume was published on October 23, 2019. It is also published in Italy by GP Manga, in France by Kana, in Spain by Norma Editorial, in Mexico by Panini Manga, in Germany by Carlsen Manga, and in Indonesia by Level Comics.
Title: Hero (novel)
Content:  subject matter and for expanding the genre of gay literature into superhero fantasy. But ultimately, the review noted, "the novel misses its mark, with an abundance of two-dimensional characters and contrived situations. ... While some may be glad to see a gay hero come out of the closet just in time to save the world, others may wish the situations felt less clichéd." Thom Creed was named #5 on a list of top 10 LGBT Book Characters. Despite the somewhat reserved praise, in May 2008, Hero won a Lambda Literary Award as the best LGBT Children's/Young Adult novel of the past year.

Question: Who is the author of Once a Hero?
Answer: Elizabeth Moon.