Inside the Billion-Dollar Succession: Who Are Mary Oppenheimer’s Children and Heirs?
When the COVID-19 pandemic struck Southern Africa in early 2020, Mary Oppenheimer Slack, alongside her daughters, announced a landmark single donation of R1 billion (approximately $55 million, $65 million). Rather than directing this capital through state-run disaster funds, they established the Mary Oppenheimer Daughters Foundation.
The creation of this specific vehicle sent a clear message to financial markets and civic leaders: the four daughters were formally stepping into their roles as stewards of sovereign-scale capital. The foundation focuses on long-term health resilience, food security, vulnerable communities, and educational scaffolding across South Africa. Operating with a lean professional secretariat, the sisters vet interventions through measurable developmental metrics rather than vanity galas.
The wider Oppenheimer family has also altered how it approaches domestic politics. Independent investigative reports track millions in transparent, multi-party campaign donations made by family trusts to centrist political parties, including the Democratic Alliance and ActionSA. While Mary and her daughters maintain a clear boundary between philanthropic work and partisan politicking, their financial presence serves as a stabilizing, moderate counterbalance in Southern Africa’s evolving coalition politics.
