Duncan runs the Rush Foundation, a charity that funds “disruptive ideas” to prevent the spread of HIV in sub-Saharan Africa. Duncan, who is a widower, has 5-year-old twins — daughter Sophia and son Nikita. After graduating from Yale University, Kim began his career as a trader at Goldman Sachs in 1987. From there, he went on to Nomura, Credit Suisse and Mizuho leading teams conducting principal investment activities in which the firms' capital was invested directly for their own account. He sits on the boards of various early stage ventures including SEEK, Curemark LLP, Pharmajet Inc, Spatial View Inc, Flying Aces Limited, Ignite Gaming Technologies, Respicopea Holdings Limited. Throughout his career, Kim has been involved in charitable endeavours such as the Big Brother programme, educational funding providing scholarships for underprivileged teenagers, cancer research and environmental charities. Kim is a co-founder of Rush, which was registered in Switzerland in September 2010 to fund disruptive ideas in the fight against HIV in sub-Saharan Africa.