Question: What role did Ansel Elgort play in the 2013 American supernatural horror film directed by Kimberly Peirce?

Context paragraphs:
The Fault in Our Stars: The Fault in Our Stars is the sixth novel by author John Green, published in January 2012.  The title is inspired by Act 1, Scene 2 of Shakespeare's play "Julius Caesar", in which the nobleman Cassius says to Brutus: "The fault, dear Brutus, is not in our stars, / But in ourselves, that we are underlings."  The story is narrated by Hazel Grace Lancaster, a 16-year-old girl with cancer.  Hazel is forced by her parents to attend a support group where she subsequently meets and falls in love with 17-year-old Augustus Waters, an ex-basketball player and amputee.  A feature film adaptation of the novel directed by Josh Boone and starring Shailene Woodley, Ansel Elgort and Nat Wolff was released on June 6, 2014.  Both the book and its film adaptation were met with strong critical and commercial success.

Divergent (film): Divergent is a 2014 American dystopian science fiction action film directed by Neil Burger, based on the novel of the same name by Veronica Roth.  The film is the first installment in "The Divergent Series" and was produced by Lucy Fisher, Pouya Shabazian, and Douglas Wick, with a screenplay by Evan Daugherty and Vanessa Taylor.  It stars Shailene Woodley, Theo James, Ashley Judd, Jai Courtney, Ray Stevenson, Zoë Kravitz, Miles Teller, Tony Goldwyn, Ansel Elgort, Maggie Q and Kate Winslet.  The story takes place in a dystopian and post-apocalyptic Chicago where people are divided into distinct factions based on human virtues.  Beatrice Prior is warned that she is Divergent and thus will never fit into any one of the factions.  She soon learns that a sinister plot is brewing in the seemingly perfect society.

Carrie (2013 film): Carrie is a 2013 American supernatural horror film, directed by Kimberly Peirce, and is the third film adaptation of Stephen King's 1974 novel of the same name.  The film was produced by Kevin Misher, with a screenplay by Lawrence D. Cohen & Roberto Aguirre-Sacasa.  The film was released by Metro-Goldwyn-Mayer and Screen Gems on October 18, 2013.  The film stars Chloë Grace Moretz as the titular Carrie White, Julianne Moore as Carrie's mother Margaret White, Judy Greer as Ms. Desjardin, Portia Doubleday as Chris Hargensen, Gabriella Wilde as Sue Snell, Ansel Elgort as Tommy Ross, and Alex Russell as Billy Nolan.

The Conjuring: The Conjuring is a 2013 American supernatural horror film directed by James Wan and written by Chad Hayes and Carey W. Hayes.  It is the first installment in "The Conjuring" series.  Patrick Wilson and Vera Farmiga star as Ed and Lorraine Warren, paranormal investigators and authors associated with prominent cases of haunting.  Their purportedly real-life reports inspired "The Amityville Horror" story and film franchise.  The Warrens come to the assistance of the Perron family (Ron Livingston and Lili Taylor), who are experiencing increasingly disturbing events in their farmhouse in Rhode Island in 1971.

Ansel Elgort: Ansel Elgort (born March 14, 1994) is an American actor, singer and a DJ (under the name Ansølo).  As a film actor, he played Tommy Ross in the horror film "Carrie" (2013), Caleb Prior in "The Divergent Series " franchise, Augustus Waters in the romantic teen drama "The Fault in Our Stars" (2014), and the title character in Edgar Wright's action thriller "Baby Driver" (2017).

Boys Don't Cry (film): Boys Don't Cry is a 1999 American biographical film directed by Kimberly Peirce and co-written by Peirce and Andy Bienen.  The film is a dramatization of the real-life story of Brandon Teena, an American trans man played in the film by Hilary Swank, who adopts a male identity and attempts to find himself and love in Nebraska but falls victim to a brutal crime perpetrated by two male acquaintances.  The film co-stars Chloë Sevigny as Teena's girlfriend.

Stop-Loss (film): Stop-Loss is a 2008 American war drama film directed by Kimberly Peirce and starring Ryan Phillippe, Channing Tatum, Abbie Cornish and Joseph Gordon-Levitt as young soldiers whose experience in the Iraq War leaves them psychologically shattered.  It was distributed by Paramount Pictures and produced by MTV Films.  While it garnered mixed to positive reviews, it earned less than half of its $25 million production budget at the box office.  The title refers to the U.S. government's controversial stop-loss policy, which allows the government to extend the term of duty of soldiers who have already served their contracted number of tours of duty in combat.

The Fault in Our Stars (film): The Fault in Our Stars is a 2014 American romantic drama film directed by Josh Boone, based on the novel of the same name by John Green.  The film stars Shailene Woodley, Ansel Elgort, and Nat Wolff, with Laura Dern, Sam Trammell, and Willem Dafoe playing supporting roles.  Woodley plays Hazel Grace Lancaster, a sixteen-year-old cancer patient who is forced by her parents to attend a support group, where she meets and subsequently falls in love with Augustus Waters, another cancer patient, played by Elgort.

Jenma Natchathiram: Jenma Natchathiram (தமிழ்: ஜென்ம நட்சத்திரம், English: Birth Star) is a 1991 Tamil supernatural horror film directed and Screenplays by Thakkali Srinivasan for Thirai Gangai Films.  The film dialogue were written by Ma.  Pandarinathan, and story were written by Krishnan respectively.  Music by Premi - Srini assets to the soundtrack.  It Stars Baby Vichithra played titular role with Pramoth, Sindhuja and Vivek played pivotal role.  The film was unofficial remake of "The Omen", 1976 British/American supernatural horror drama film directed by Richard Donner.

Billionaire Boys Club (2017 film): Billionaire Boys Club is an upcoming American biographical crime-drama film directed by James Cox and co-written with Captain Mauzner.  The film stars Ansel Elgort, Taron Egerton, Kevin Spacey, Jeremy Irvine, Cary Elwes, Emma Roberts, Suki Waterhouse, Judd Nelson and Billie Lourd.  Principal photography began on December 7, 2015 in New Orleans.

Supporting paragraphs: Ansel Elgort Carrie (2013 film)
Answer: Tommy Ross