scenario, based on Thorne's work, about "the most exotic events in the universe suddenly becoming accessible to humans," and attracted filmmaker Steven Spielberg's interest in directing. The film began development in June 2006, when Spielberg and Paramount Pictures announced plans for a science-fiction film based on an eight-page treatment written by Obst and Thorne. Obst was attached to produce. By March 2007, Jonathan Nolan was hired to write a screenplay. After Spielberg moved his production studio DreamWorks from Paramount to Walt Disney Studios in 2009, Paramount needed a new director for Interstellar. Jonathan Nolan recommended his brother Christopher, who joined the project in 2012. Christopher Nolan met with Thorne, then attached as executive producer, to discuss the use of spacetime in the story. In January 2013, Paramount and Warner Bros. announced that Christopher Nolan was in negotiations to direct Interstellar. Nolan said he wanted to encourage the goal of human spaceflight, and intended to merge his brother's screenplay with his own. By the following March, Nolan was confirmed to direct Interstellar, which would be produced under his label Syncopy and Lynda Obst Productions. The Hollywood Reporter said Nolan would earn a salary of against 20% of the total gross. To research for the film, Nolan visited NASA and the private space program at SpaceX. Warner Bros. sought a stake in Nolan's production of Interstellar from Paramount, despite their traditional rivalry, and agreed to give Paramount its rights to co-finance the next film in the Friday the 13th horror franchise, with a stake in a future film based on the television series South Park. Warner Bros. also agreed to let Paramount co-finance an indeterminate "A-list" property. In August 2013, Legendary Pictures finalized an agreement with Warner Bros. to finance approximately 25% of the film's production. Although it failed to renew its eight-year production partnership with Warner Bros., Legendary reportedly agreed to forgo financing Batman v Superman: Dawn of Justice (2016) in exchange for the stake in Interstellar. Writing and casting Screenwriter Jonathan Nolan worked on the script for four years. To learn the scientific aspects, he studied relativity at the California Institute of Technology. Jonathan was pessimistic about the Space Shuttle program ending and how NASA lacked financing for a human mission to Mars, drawing inspiration from science-fiction films with apocalyptic themes, such as WALL-E (2008) and Avatar (2009). Jeff Jensen of Entertainment Weekly commented: "He set the story in a