Title: The Unknown (novel)
Content:  The Unknown is the fourteenth book in the Animorphs series, written by K.A. Applegate. It is narrated by Cassie.
Title: The Unknown (1963 anthology)
Content:  The Unknown is an anthology of fantasy fiction short stories edited by D. R. Bensen and illustrated by Edd Cartier, the second of a number of anthologies drawing their contents from the American magazine Unknown of the 1930s-1940s. It was first published in paperback by Pyramid Books in April 1963. It was reprinted by the same publisher in October 1970, and by Jove/HBJ in August 1978 A companion anthology, The Unknown Five, was issued in 1964. The book collects eleven tales by various authors, together with a foreword by Isaac Asimov and an introduction by the editor.
Title: The Book of Unknown Americans
Content:  The Book of Unknown Americans is a 2014 novel by Cristina Henríquez published by Knopf. The story is told from multiple first-person points of view, with the two main narrators being Alma Rivera, a 30-something housewife from Pátzcuaro, Mexico, and Mayor Toro, a teenage social outcast and first-generation American whose parents were originally from Panama.
Title: Unknown (1988 anthology)
Content:  Unknown is an anthology of fantasy fiction short stories edited by Stanley Schmidt, the fifth of a number of anthologies drawing their contents from the classic magazine Unknown of the 1930s-1940s. It was first published in paperback by Baen Books in October 1988. The book collects nine tales by various authors, together with an introduction by the editor.
Title: Letter from an Unknown Woman
Content:  Letter from an Unknown Woman (Brief einer Unbekannten) is a novella by Stefan Zweig. Published in 1922, it tells the story of an author who, while reading a letter written by a woman he does not remember, gets glimpses into her life story.
Title: The Unknown Shore
Content: Jack Byron – protagonist ; Tobias Barrow – "Jack's" friend 
Title: The Unknown Gods
Content:  The Unknown Gods was written by Bob Bledsaw, Mark Holmer, Jennell Jaquays, and Mike Petrowsky, and was published by Judges Guild in 1980 as a 48-page book. TSR opted not to renew Judges Guild's license for D&D when it expired in September 1980. The Book of Treasure Maps II (1980) and The Unknown Gods (1980) were among Judges Guild’s final products that bore the older D&D logo.
Title: Unknown (magazine)
Content:  which magic found easy mention in Unknown". Other Astounding writers who wrote for Unknown included Robert A. Heinlein, whose "The Devil Makes the Law" (reprinted as "Magic, Inc.") depicts a world where magic is a part of everyday life. Heinlein also contributed "The Unpleasant Profession of Jonathan Hoag" and "They", described by Ashley as "perhaps the ultimate solipsist fantasy". A.E. van Vogt, a frequent Astounding contributor, appeared in the final issue with "The Book of Ptath" (later expanded into a novel). Isaac Asimov, despite multiple attempts to write for Unknown, never appeared in the magazine. On his sixth attempt, he sold "Author! Author!" to Campbell, 
Title: The Unknown Five
Content:  The Unknown Five is an anthology of American fantasy fiction short stories edited by D. R. Bensen and illustrated by Edd Cartier, the fourth of a number of anthologies drawing their contents from the American magazine Unknown of the 1930s-1940s. It was first published in paperback by Pyramid Books in January 1964. The cover title of this first edition was The Unknown 5; the numeral was spelled out on the title page and copyright statement. The book was reprinted by Jove/HBJ in October 1978. It has also been translated into German. It was a follow-up to a companion anthology, The Unknown, issued in 1963. The book collects five tales by various authors, together with an introduction by the editor. All are from Unknown but the Asimov piece, which had been slated to appear therein in 1943 but was not then published due to the demise of the magazine.
Title: Unknown Quantity
Content:  The Unknown Quantity is a mystery novel by Mignon G. Eberhart published by Random House in 1953 and was issued in the UK by Collins Crime Club that same year. It was reprinted in 1990 by Warner Books.

Question: Who is the author of Unknown?
Answer: Stanley Schmidt.
Stanley Albert Schmidt.