Thomas Olde Heuvelt, born on April 16, 1983, is an acclaimed Dutch author known for his contributions to the horror genre. Heuvelt's talent for storytelling has earned him the prestigious Hugo Award for Best Novelette and the Dutch Paul Harland Prize, along with multiple nominations for additional Hugo Awards and a World Fantasy Award.

Heuvelt was born in Nijmegen, Netherlands and pursued his passion for literature at Radboud University Nijmegen and the University of Ottawa in Canada. From an early age, he was inspired by literary giants such as Roald Dahl and Stephen King, fostering a love for sinister and dark fiction. He later found inspiration from a broader range of contemporary writers, including Jonathan Safran Foer, Carlos Ruiz Zafón, Neil Gaiman, and Yann Martel, whom he considers his most significant influences.

As the international bestselling author of HEX, Heuvelt's work has been published in over twenty-five countries and is under development for a television adaptation by Gary Dauberman. With the unique distinction of being the first translated author to win a Hugo Award, he further cemented his reputation with his short story "The Day the World Turned Upside Down." His novel ECHO was released by Nightfire Books in the US and Hodder & Stoughton, and following its success, the internationally awaited novel ORACLE topped all bestseller charts in the Netherlands in March 2021.

Residing in both the Netherlands and the south of France, Heuvelt is also an enthusiastic mountaineer, often drawing from his experiences to enhance his gripping narratives.