We have dedicated this issue of BILLIONAIRE to Giving. We look in depth at the ongoing war in Syria which has ignited the worst humanitarian crisis of our time – and those who are trying to help, whether through micro nance, education, design, or political art.

We speak to four billionaire philanthropists who are enhancing the world by giving back: Bill Heinecke, with his much-loved ai elephant foundation; Mo Ibrahim, with the transformative Index of African Governance; Ajay Piramal, the businessman using technology to provide clean water to India’s poorest; and Judith Neilson with her ground-breaking White Rabbit gallery in Sydney.

We look inside Angelina Jolie’s favourite resort, Phum Baitang in Cambodia, a hotel with social enterprise at its core.