Julia Hartley Moore

Julia Hartley Moore is a New Zealand private investigator, author and producer who is the founder of the Auckland-based private investigation firm, Julia Hartley Moore Limited (previously Arbeth & Co Limited). Her firm specialises in infidelity, scam, and child custody cases. She has published several books about her work as a private investigator, including multiple editions of Infidelity: Exploding the Myths.

Personal life Julia Hartley Moore is a native of New Zealand. She is a great-granddaughter of the Yorkshire poet John Hartley. Julia is dyslexic (a fact that was not discovered until she was aged 40) and left school at age 14. She had her first child at age 15 and married her first husband when she found out she was pregnant.

Hartley Moore has married four times. She is currently married to television producer Steve Butler, whom she married in 2009. In this role she helped uncover a staff theft ring. She initially worked fraud cases for an insurance company, but soon began specialising in infidelity cases. She has also worked other types of cases involving scenarios like extortion, and employee monitoring (among others). In 2000 she wrote her first book Julia Moore, PI, which was published by Penguin Books. In 2004, she authored Infidelity: Exploding the Myths, which was published by HarperCollins in which she documents her work investigating infidelity cases. Multiple editions of the latter book have since been released, including by Ulysses Press in 2006 and Exisle Publishing in 2011. This was followed up by Suddenly Single, which was published by HarperCollins in 2007.

Hartley Moore is a regular commentator on television and radio, appearing on TVNZ's 1News, TVNZ's current affairs programme Seven Sharp, and has been a panelist on Radio New Zealand's The Panel for over 20 years. In the 1990s she appeared on the television show Private Investigators. She has also appeared on Australian television's Channel 7. and The New Zealand Herald network in 2025. It was subsequently released in the UK on Sky and in Australia in Channel 9. The documentary investigates the high-profile case of an eye surgeon accused of murdering his wife, exploring the complex legal and emotional dimensions of the trial.