Nathan Geffen is the founder and editor of GroundUp, a news agency based in Cape Town that focuses on human rights related stories. He was alternatively the Treasurer, National Manager and Policy Director of the Treatment Action Campaign (TAC) from 2000 to 2013. He was the editor of TAC’s magazine, Equal Treatment, until 2008. He is the author of Debunking Delusions: The inside story of the Treatment Action Campaign, and the author of numerous academic and media articles. Geffen has a PhD in computer science from the University of Cape Town. His doctorate examined algorithms for modelling sexually transmitted infectious diseases.