Background and career
Leonard Hasting "Len" Ainsworth (born c. 1923) is an Australian businessman, most widely known for founding Aristocrat Leisure, one of the world's largest gambling-machine companies. He founded the company in 1953, and remained active until 1994; and later founded Ainsworth Gaming Technology, and was an executive director until 2019.
Ainsworth inherited a small business from his father and began making poker machines to boost revenues for his dental supplies and equipment manufacturing venture. This side-line quickly grew, and Aristocrat Leisure was born in 1953. Today, it is one of the world's largest manufacturers of slot machines and online gaming entertainment. Following a 1984 diagnosis of prostate cancer, Ainsworth sold Aristocrat, giving significant funds to his family, several members of which continue the tradition of philanthropy. Following a clear diagnosis, Ainsworth initially retired and then established Ainsworth Gaming Technology, a manufacturer of up to about 35 percent of Australia’s gambling machines. Ainsworth sold his majority stake in Ainsworth Gaming Technology to Novomatic for A$473 million, when he was aged 94 years.
Ainsworth has seven sons, five to his first wife Betty and later, two to his second wife Margarette (Gretel). In 2018, Ainsworth was appointed as a Member of the Order of Australia (AM) for his impact on business and manufacturing as well as his service to the community through philanthropic contributions. Ainsworth has donated to the Sydney Children’s Hospital Foundation, St Vincent’s Private Hospital and the Children's Medical Research Institute, the University of Wollongong, and the University of New South Wales. He has been awarded two honorary doctorates, the first by the University of NSW and most recently in 2019 by the University of Wollongong. Ainsworth signed The Giving Pledge in March 2017.
In 2019, Ainsworth was ranked 42nd on the Forbes list of 50 wealthiest Australians, with an estimated net worth of US$900 million. As of May 2025, Ainsworth was listed 24th on the Financial Review 2025 Rich List with an estimated net worth of A$6.69 billion.
Sources
Net-worth figure: Celebrity Net Worth (October 2026), in USD. Biography and career facts: the person's Wikipedia article and linked reporting. Snapshot date for all StarWorth figures: 28 October 2026.
