Over 350 participants from around 100 countries will be meeting at the IAEA Headquarters in Vienna from 7 to 10 July 2014 for the International Conference on Advances in Nuclear Forensics: Countering the Evolving Threat of Nuclear and Other Radioactive Material out of Regulatory Control. Khammar Mrabit, Director of the IAEA Division of Nuclear Security, explains what Nuclear Forensics is and how the IAEA assists its Member States in this field.