[8] Moving to New York to train in financial services, he worked for Salomon Brothers as a fixed income trader and at Credit Suisse First Boston.

[17] In December 2019, Barrons reported that "the roughly $19 billion fund is taking the view that next year will bring more investment opportunities among distressed companies, meaning those that are in default, restructuring, or at risk of either event.

[21] According to ValueWalk, "The addition of Hintze is viewed as a significant positive for the Vatican" due to the fact that he is a "no nonsense manager with deep insight into a broad range of international finance matters.

[8] In 2007, Hintze established MH Premium Farms (MHPF),[24] a group of agriculture companies based mainly in Australia.

As of 2017[update], MHPF owned more than twenty properties[25] in eastern Australia, covering a total area of more than 70,000 hectares (170,000 acres).

The properties offer a broad portfolio including: fat lambs, wool and cattle; broadacre cropping of cereals and oilseeds; irrigated cotton and sugar.

The gift will be used in part to fund programmes to study problems that threaten Earth's biodiversity such as the maintenance of delicate ecosystems and the impacts of environmental pollution, as well as the battle against diseases such as malaria.

[33] Through CQS and the Hintze Family Charitable Foundation he provided funding to create a 'theatre in the round' at the Old Vic in London, amongst other significant support.

Hintze gave a $1 million gift to the University of Sydney's Charles Perkins Centre, which focuses on turning medical research into viable treatments.

[38] He has also provided support to the Black Stork Charity to help construct one of the most advanced centres for rehabilitation of injured military personnel in the world.

Funding was provided for the construction of a residential wing at St. John's College at the University of Sydney, which was named the Hintze Building.

[45] The Guardian reported that Hintze is a donor to the Global Warming Policy Foundation, which casts doubt on the science and cost of tackling climate change.

[49] He was initially appointed to the National Gallery's Board of Trustees by then Labour Party Prime Minister Gordon Brown in 2008.

[52] He was also named on the Evening Standard's "Progress 1000" list of "London's most influential people," citing his philanthropic contributions and business success.

[55] In May 2008, David Cameron declared a donation from Hintze to the Conservative Party that was used to pay for drinks receptions for Tory MPs and their partners.

[58] These disclosures led to the resignation of Liam Fox (who was then Secretary of State for Defence) and the dismissal of Hintze's then-charity adviser, Oliver Hylton.

In January 2013, Hintze was appointed Member of the Order of Australia (AM) for his "significant service to the community through philanthropic contributions to organisations supporting the arts, health and education.