Andy Muschietti

Muschietti was born and raised in Vicente López, Buenos Aires and has one older sister, Barbara Muschietti. Both he and his sister studied at Fundación Universidad del Cine. He worked as a storyboard artist during his early years in the film industry. He is of Italian-Argentine ancestry. In 2013, Muschietti directed his debut film, the supernatural horror Mama, which he co-wrote with Neil Cross and his sister Barbara Muschietti, with the latter also acting as producer. It was based on Muschietti's three-minute short film Mamá, which attracted Guillermo del Toro, who stated that it had the "scariest" scenes he had "ever seen." The short convinced del Toro to executive produce the feature-length film, which starred Jessica Chastain, Nikolaj Coster-Waldau, Megan Charpentier and Isabelle Nelisse, and was released by Universal Pictures on 18 January 2013. The film had had a budget of $15 million, and grossed more than $146 million.

In September 2013, Universal hired Muschietti for a reboot of The Mummy franchise, but he left the project in May 2014 due to creative differences with Jon Spaihts' draft of the script.

In July 2015, after the departure of Cary Joji Fukunaga, Muschietti was hired by New Line Cinema to direct It, the two-part adaptation of the Stephen King novel. Barbara produced it, along with Dan Lin, Roy Lee, Seth Grahame-Smith and David Katzenberg. The film was released in two chapters in 2017 and 2019.

In July 2019, Muschietti entered into negotiations to direct The Flash, a film set in the DC Extended Universe, from a screenplay by Christina Hodson; his sister, Barbara, was set to serve as a producer. Muschetti was the fifth director to have been attached to The Flash (Seth Grahame-Smith, Rick Famuyiwa, John Francis Daley & Jonathan Goldstein had previously been attached to it at various points). In August 2019, Muschietti confirmed that The Flash would be his next project, following the release of It Chapter Two.

In April 2021, Andy and Barbara Muschietti formed their own production company, called Double Dream, with The Flash serving as the company’s first project.

The Flash had its world premiere on 25 April 2023 at CinemaCon; this was followed by a wide release on 16 June 2023.

In June 2023, Muschietti was reported to be the studio's top choice to direct The Brave and the Bold for the DC Universe. Muschietti would not formally commit to the film until a script materialized after the 2023 Writers Guild of America strike concluded. Muschietti was confirmed to sign on later in the month. Later that month, he, Barbara and their production company Double Dream signed parallel three-year first-look deals with Warner Bros. Pictures, Warner Bros. Television Group., and Max.