How Not to Get Lost in Big Data

Juliette Garside is deputy business editor of the Guardian and the Observer. A business writer by training, she specialises in tax and offshore investigations. In 2016, her scoop on the financial affairs of David Cameron's family forced him to become the first British prime minister to publish his tax returns.

Stephen Grey is a British investigative journalist and special correspondent for Reuters. He has published several books including The New Spymasters and Ghost Plane, which revealed details of the CIA’s program of ‘extraordinary rendition.’ He has also reported extensively from the conflicts in Iraq and Afghanistan.