Who wrote the original Jurassic Park novel?

Michael Crichton wrote the original Jurassic Park novel.

Published in October 1990 by Alfred A. Knopf, Jurassic Park is a science-fiction thriller about a failed attempt to create a dinosaur theme park through genetic engineering. The story combines paleontology, biotechnology, corporate ambition, and chaos theory, a recurring intellectual theme in Crichton's fiction.

Crichton originally developed the idea as a screenplay in the early 1980s, but he eventually decided that a novel was the better format for handling the scientific explanations and the expensive-to-film concept. He revised the project several times before submitting the manuscript to Knopf in 1990.

The 1993 film adaptation directed by Steven Spielberg was based on Crichton's novel, although it changed character traits, scenes, and some major plot details. Crichton also wrote the sequel novel, The Lost World, published in 1995. A common mix-up is confusing the original novel with the film's junior novelization, which was a separate adaptation associated with Crichton and other writers.