This film, which he made at age 39, had attracted the attention of Guillermo del Toro, who then served as executive producer.
He gained further recognition for directing both films in the It film series.
The first being the 2017 eponymous film adaptation of the Stephen King novel It, which became the highest-grossing horror film of all time, and the second being its 2019 second part, It Chapter Two.
Both are distributed by Warner Brothers and produced by New Line Cinema.
Muschietti is set to direct two upcoming films, also for Warner Brothers: The Flash starring Ezra Miller, set in the DC Extended Universe, and a live action adaptation of Attack on Titan.