Chris McGreal is a foreign correspondent for The Guardian in the UK, and now based in the US. Over the years he has covered Africa widely, and Israel and the Middle East from Jerusalem where he was a correspondent covering the second Palestinian uprising. Chris has covered the Angolan civil war, the invasion of Zaire, Nigeria's military rule, the political violence of Robert Mugabe in Zimbabwe, and won the Amnesty International award for his investigations into the organizers behind the Rwandan genocide. He received the Martha Gelhorn Award for reporting from the Israeli-Palestinian territories. His series on retracing the route of the Grapes of Wrath and America's modern economic depression earned runner up for Print Feature Story of the Year by the Foreign Press Association. His recent book -- "American Overdose: The Opioid Tragedy in Three Acts" -- is perhaps the most comprehensive portrait of the opioid epidemic ravaging communities and exposes how pharmaceutical industry corruption has hooked Americans on addictive drugs and co-opted the FDA.