After leaving Anglo American in 2000, he filled numerous senior roles at De Beers diamond mining company in Southern Africa and London until 2012.
[citation needed] Oppenheimer has been involved in many aspects of his family’s activities, including establishing the Brenthurst Foundation, a Johannesburg-based think-tank which examines ways to drive Africa's sustainable growth,[11] and the formation of Tana Africa Capital, a joint venture between the Oppenheimer family and Temasek Holdings (Singapore) to pursue African consumer goods business opportunities.
[citation needed] Oppenheimer purchased Tswalu Kalahari Reserve, immediately ended hunting, and improved conditions for wild animals found there.
On 23 March 2020 Nicky and Jonathan Oppenheimer announced their commitment to tackle the unfolding health crisis in South Africa, and highlighted the exceptional challenges that small businesses were facing.
The Trust’s immediate aim was to extend direct financial support to SMME employees at risk of losing their jobs or suffering serious loss of income due to the pandemic and subsequent national lockdown.