 Writer Mark Protosevich was hired in 2011, although two story treatments by him were rejected.After a final story idea was chosen, Rick Jaffa and Amanda Silver were hired in 2012 to write a draft of "Jurassic Park IV" that would incorporate ideas from Spielberg.Colin Trevorrow was hired as director in 2013, and the film was delayed once more to give Trevorrow and his writing partner Derek Connolly more time to perfect the script by Jaffa and Silver.