Universal Pictures intended to begin production of a fourth "Jurassic Park" film in 2004 for a mid-2005 release but was in development hell while the script underwent several revisions. Following a suggestion from executive producer Steven Spielberg, writers Rick Jaffa and Amanda Silver explored the idea of a functional dinosaur park. Once Trevorrow was hired as director in 2013, he followed the same idea while developing a new script with Connolly. Filming lasted from April to August 2014 in Louisiana and Hawaii. The dinosaurs were created by Industrial Light & Magic using CGI and by Legacy Effects using life-sized animatronics. Production was completed in May 2015.