Question: Who was executive producer of the Andy Muschietti film in which Megan Charpentier played Victoria?
Context: Brad Kern is an American television producer and writer.  He has been Executive Producer/Showrunner of CBS TV's hit, "" since midway through season two.  Previously, he served as Executive Producer/Showrunner on CW's supernatural, "Beauty and the Beast" for three seasons; and, prior to that, Executive Producer of the FOX action adventure, "Human Target".  He was also Executive Producer/Showrunner on the hit supernatural drama "Charmed" for all eight seasons.  Before that, he was Executive Producer/Showrunner of the award-winning Fox series "New York Undercover".  Other previous credits include Co-Executive Producer on "", Supervising Producer on "The Adventures of Brisco County, Jr.", and Executive Story Editor on "Hill Street Blues". Megan Charpentier is a Canadian actress who is perhaps best known for her role as the feral child Victoria in the 2013 horror film "Mama" and as the new Red Queen in "".  She is also commonly known for playing the younger version of characters in the media. Heritage Oval is a cricket ground in Toowoomba, Queensland, Australia.  The first recorded match on the ground came in 1972 when Toowoomba played Queensland.  It held its only first-class match in 1994 when Queensland played an England XI side, with the match ending in a victory by 37 runs for the England XI.  The ground later held a Twenty20 match in the 2006–07 Big Bash when Queensland played Victoria, with Queensland winning by 38 runs. Lower Domain Ground (also known as the Association Ground) was a cricket ground in Hobart, Tasmania, Australia.  The first recorded match held on the ground came in 1835 when Hobart Town played United Services.  The ground held a single first-class match in 1858 when Tasmania played Victoria, which in a 69 run victory for Victoria.  The last recorded match on the ground was between Southern Tasmania Cricket Association and the Australians.  The ground is now defunct as a cricket venue. Isabella Heathcote (born 27 May 1987) is an Australian actress.  She began her acting career in 2008.  The following year, she had a recurring role as Amanda Fowler on the television soap opera "Neighbours".  Heathcote played Victoria Winters in Tim Burton's film adaptation of "Dark Shadows", Jane Bennett in "Pride and Prejudice and Zombies", and Gigi in "The Neon Demon".  She plays Nazi national Nicole Dörmer in the dystopian historical thriller series "The Man in the High Castle" and appeared as Leila Williams, a deranged ex-lover of Christian Grey, in the erotic romance film "Fifty Shades Darker". Dete Meserve is an award-winning and bestselling author as well as film and television executive and a principal of Wind Dancer Films.  Wind Dancer Films is best known as the creators and producers of Home Improvement starring Tim Allen, What Women Want starring Helen Hunt and Mel Gibson, Where The Heart Is starring Natalie Portman.  Meserve's credits include producing Bernie starring Jack Black, Shirley MacLaine and Matthew McConaughey, executive producer of Walker Payne starring Sam Shepard and Jason Patric, executive producer of the TV series Wildest Africa for Discovery International, executive producer of As Cool As I Am, starring Claire Danes and James Marsden.  In 2014, she was an executive producer of the George Lopez sitcom, "Saint George," and producer of the thriller, The Keeping Room starring Sam Worthington, Hailee Steinfeld and Brit Marling.  She is currently an Executive Producer of the hit kids television series Ready Jet Go on PBSKids. Grumpy Cat's Worst Christmas Ever is a 2014 made-for-television Christmas film that stars the Internet celebrity Grumpy Cat.  The movie first aired on the Lifetime on November 29, 2014 and stars Megan Charpentier as a young girl that befriends and later adopts Grumpy Cat, only to discover that the two can communicate with one another. Mama is a 2013 English-language Spanish supernatural drama horror film directed and co-written by Andy Muschietti and based on his 2008 Argentine short film "Mamá".  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. 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". It: Chapter One, or simply It, is a 2017 American supernatural horror film directed by Andy Muschietti, based on the 1986 novel of the same name by Stephen King.  The screenplay is by Chase Palmer, Cary Fukunaga and Gary Dauberman.  The first of a planned duology, the film tells the story of seven children in Derry, Maine, who are terrorized by the eponymous being, only to face their own personal demons in the process.  The novel was previously adapted into a 1990 miniseries.
Answer: Guillermo del Toro