Joe Cirincione, author, MSNBC contributor and president of the global security foundation Ploughshares Fund, is one of the country’s foremost experts on nuclear threats and nuclear policy. He will discuss the risk of nuclear war today, focused on three interrelated regional issues: war in the Middle East given mounting tensions between the US and Iran; war with North Korea should nascent negotiations fail; and nuclear war triggered by miscalculation or intent as nations rebuild their arsenals and create nuclear weapons they believe will be more usable in conflicts.