Robert Kelley is a veteran of over 35 years in the US Department of Energy nuclear weapons complex, most recently at Los Alamos. He worked in research and engineering before turning to information analysis in the 1980s. He managed the centrifuge and plutonium metallurgy programs at Lawrence Livermore National Laboratory and later was Director of the Department of Energy Remote Sensing Laboratory, the premier US nuclear emergency response organization. He was also seconded by the USDOE to the IAEA where he served twice as a Director of the nuclear inspections in Iraq in 1992 and again in 2001. Kelley is currently based in Vienna. He has carried out professional travel to more than 20 countries.
The Democratic People’s Republic of Korea (DPRK, North Korea) conducted its sixth nuclear test on 3 September 2017. Preliminary estimates of yield are in the range of 100 to 150 kilotons (kt), although this figure will be subject to revision over a period of weeks. In the end, the degree of uncertainty is likely to be tens of kilotons.