Who produced the film with which Andy Muschietti was best known for directing? 
Andy Muschietti: Andrés Muschietti (] ;; born 26 August 1973), usually credited as Andy Muschietti, is an Argentine film director and screenwriter, best known for directing the 2013 horror film "Mama" and the 2017 adaptation of Stephen King's "It". Mama (2013 film):  The film stars Jessica Chastain and Nikolaj Coster-Waldau, and is produced by Zandy Federico and co-writer Barbara Muschietti, with Guillermo del Toro serving as executive producer.
Zandy Federico