Lee Child (pen name of British author James “Jim” Grant) wrote the Jack Reacher novels, and the more recent books are co‑written and now continued by his brother Andrew Child (Andrew Grant).

Who wrote Jack Reacher?

  • The Jack Reacher book series was created and originally written by Lee Child, a British thriller author.
  • His real name is James Dover Grant, and “Lee Child” is the pen name he uses on all the Reacher books.

Over time, the series grew to dozens of novels and short stories about Jack Reacher, an ex–military policeman who wanders the United States solving dangerous problems.

What about Andrew Child?

  • In 2020, Lee Child announced he was stepping back and bringing in his younger brother, author Andrew Grant, who writes under the name Andrew Child.
  • Starting with the novel The Sentinel (2020), Jack Reacher books have been credited to both Lee Child and Andrew Child, with Andrew gradually taking over.
  • By the 30th novel, Exit Strategy , Andrew Child is the sole credited author of the series, with Lee fully handing over the reins.

So if you’re asking “who wrote Jack Reacher?” the classic and most accurate answer is Lee Child, while the latest Jack Reacher novels are now written by Andrew Child, continuing the series Lee created.

TL;DR:
The Jack Reacher series was created and long written by Lee Child (Jim Grant); recent and future books are written by his brother Andrew Child.