Question: Hannah Baker is a fictional character created by which American author, she is played by Katherine Langford, an Australian actress?

Context paragraphs:
Hannah Baker: Hannah Baker is a fictional character created by American author Jay Asher.  She is the subject of his 2007 mystery novel "Thirteen Reasons Why", and Netflix's adaptation of the book, "13 Reasons Why".  Hannah is introduced as a sophomore at the fictional Liberty High School, characterized by her struggle adjusting to life in an unsympathetic school environment.  She is played by Katherine Langford on the television series.  Langford is signed on to appear in the show's second season, which is set to air in 2018.

Harry Bosch: Detective Hieronymus 'Harry' Bosch (pronounced "He-ron-ee-mus" "Bosh") is a Fictional character created by American author Michael Connelly.  Bosch debuted as the lead character in the 1992 novel "The Black Echo", the first in a best-selling police procedural series now numbering twenty-one novels.

Hannah Wilson (Home and Away): Hannah Wilson is a fictional character from the Australian soap opera "Home and Away", played by Cassie Howarth.  The character made her first screen appearance on 29 August 2013.  She was introduced as part of established character Zac MacGuire's (Charlie Clausen) extended family.  Hannah is characterised as a "strong and determined" and very family orientated.  She arrives in Summer Bay with newfound responsibility of looking after her dead sister's children Oscar (Jake Speer) and Evelyn MacGuire (Philippa Northeast).  She takes a job at the local hospital as a nurse.  Her early storylines focused mainly on the MacGuire family and Hannah shared a brief relationship with brother-in-law Zac.  Producers created a new partnership between Hannah and Andy Barrett (Tai Hara).  The latter being a self-destructive character, their relationship is short-lived following the revelation that he is a drug dealer.

Major General West: Major General West, is a fictional character in the Stargate SG-1 universe, played by Leon Rippy.  West headed the USAF's Project Giza (also known as the Stargate Project), the forerunner of the SGC.  He oversaw Dr. Catherine Langford's experiments with the Stargate until selecting, recalling, and delegating Colonel Jack O'Neil as military commander when Dr. Daniel Jackson joined the team.  Upon the successful connection of the Earth Stargate to Abydos, West immediately militarized the program and locked out most of the civilian team previously under Dr. Langford.  He then authorized the initial excursion to Abydos (in the original movie).

Hannah Montana 2: Meet Miley Cyrus: Hannah Montana 2: Meet Miley Cyrus is a double album by American singer and actress Miley Cyrus and her fictional character Hannah Montana from the television series of the same name.  It was released on June 26, 2007, by Walt Disney Records and Hollywood Records.  The first disc serves as the soundtrack album from the second season of "Hannah Montana", while the second disc serves as the debut studio album by Cyrus, the series' primary actress.  All twenty tracks are performed by Cyrus, although the first disc is credited to her character Hannah Montana in the vein of the original soundtrack, "Hannah Montana" (2006).  The lyrical themes revolve largely around "girl power", teen romance, and the double life that Cyrus' character lives on the program.

Isabel Evans: Isabel Evans is a fictional character created by Melinda Metz for the young adults book series "Roswell High" and adapted by Jason Katims for the 1999-2002 American science fiction television series "Roswell".  She was portrayed by actress Katherine Heigl in the television series.

Peter Warren Hatcher: Peter Warren Hatcher is a fictional character created by American author Judy Blume.  He first appeared in the children's novel "Tales of a Fourth Grade Nothing" and in several subsequent Blume stories, most of which focus on his younger brother Fudge.  In the television series "Fudge", he is played by Jake Richardson.

Katherine Langford: Katherine Langford (born 29 April 1996) is an Australian actress.  She is known for playing Hannah Baker in the 2017 Netflix series "13 Reasons Why", based on the novel of the same name.

Sansa Stark: Sansa Stark is a fictional character created by American author George R. R. Martin.  She is a prominent character in Martin's award-winning "A Song of Ice and Fire" series.

Petyr Baelish: Petyr Baelish, nicknamed Littlefinger, is a fictional character created by American author George R. R. Martin.  He is a prominent non-point of view character in Martin's "A Song of Ice and Fire" series, and a main character in HBO's adaptation of the series, "Game of Thrones", where he was portrayed by Aidan Gillen.  In "A Storm of Swords", it is revealed that several major plot points have hinged on Baelish's intrigues, including the framing of Tyrion Lannister for the attempt on Bran Stark's life, the downfall of Lord Eddard Stark, the deaths of Lord Jon Arryn and King Joffrey Baratheon, and the War of the Five Kings.

Supporting paragraphs: Hannah Baker Katherine Langford
Answer: Jay Asher