Lauren Oliver

She simultaneously began working at Penguin Books, in a young adult division called Razorbill, where, she started work on Before I Fall. She left in 2009 to pursue writing full time and now happily works at home.

Oliver's first book, Before I Fall, was published on March 2, 2010, by HarperCollins in the United States, and by Hodder & Stoughton in the United Kingdom. The book follows Sam, a teenage girl, who has to go through the last day of her life seven times and each time learns new values and the mysteries surrounding her death. Oliver has said that she wrote all of the book on her BlackBerry while she went to meetings on the subway. She would e-mail herself the chapters to later work on them some more.

Oliver's first middle-grade book, about a girl who is visited by a ghost who says her dead father is stuck in Limbo and that only she can help him over, was published on September 1, 2011. Her second middle-grade book, The Spindlers, tells the story of a young girl, Liza, who travels into a fantastical underworld to rescue her younger brother from the sinister creatures. The book was released on August 2, 2012.

Oliver's second book, Delirium, is the first in her dystopian trilogy. Oliver's first novella, Hana, was released after Delirium' and shows Hana's perspective on the events of Delirium. The trilogy's second book, Pandemonium, was released on February 28, 2012. Another novella, Annabel, was released on December 26, 2012 as an e-book and has events before those unfolding in Delirium such as details the story of Lena's mother prior to the events.

The third and final book of the trilogy, Requiem, was published on March 5, 2013. A third novella, Raven, was published along with the third book, Requiem, on March 5, 2013 as an e-book and follows Raven on her life and adventures between the events of Pandemonium and Requiem. On March 5, 2013, all three of the novellas (Hana, Annabel, and Raven) were released together in a softcover book.

That novel was followed by her first adult novel, Rooms, on September 23, 2014, and another teen novel, Vanishing Girls, on March 10, 2015. Vanishing Girls tells the story of two sisters, Dara and Nick, who deal with the aftermath of a disastrous car accident that has put a strain on their once-inseparable relationship. The book alternates between the perspectives of Dara and Nick until Dara disappears unexpectedly around the same time that a local 9-year old vanishes. Convinced that the two disappearances are connected, Nick decides that she must find out what happened to her sister before it is too late. The book is a psychological thriller that uses regular prose as well as multimedia elements to unfold the mystery.

Oliver's third book for younger readers and the first of a new series was released on September 29, 2015. Curiosity House: The Shrunken Head is a novel written in collaboration with H.C. Chester.

Open Road Films released the film version in theatres on March 3, 2017, with Zoey Deutch portraying the main character, Samantha Kingston.

In 2019, she became the president of Glasstown West, the company's film and TV division, and she simultaneously began work on Hookline, an aggregate platform of social AR iconography slated for launch in 2020.