The Lost World: Jurassic Park is a 1997 American science-fiction adventure film and the second installment in the Jurassic Park film series. A sequel to 1993's Jurassic Park, the film was directed by Steven Spielberg and written by David Koepp, loosely based on Michael Crichton's 1995 novel The Lost World. The film was produced by Gerald R. Molen and Colin Wilson. Actor Jeff Goldblum returns as the chaos-theorist and eccentric mathematician Ian Malcolm, leading a cast that includes Julianne Moore, Pete Postlethwaite, Vince Vaughn, Vanessa Lee Chester, and Arliss Howard. Goldblum is the only actor from the previous film to return with a major role. Cameos feature return appearances by Richard Attenborough as John Hammond and a brief appearance by Joseph Mazzello and Ariana Richards as Hammond's grandchildren Tim and Lex.