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Timothy Jorgensen is a molecular radiation biologist at Georgetown University in Washington DC where he specialises in cancer epidemiology and public health. He studies how human cells repair radiation-induced DNA damage and what makes some cancer cells resistant to radiotherapy. His latest book is Strange Glow, The Story of Radiation.

Melissa Denecke is the Scientific Director of the Dalton Nuclear Institute at the University of Manchester. Her research on the structure of radioactive elements at the atomic level has important implications for the deep geological disposal of radioactive waste and assessment of contamination legacies. She is also a world leader in the application of synchrotron-based X-ray techniques to actinide speciation investigations.

Nicolas Prantzos is a Research Director at the Paris Astrophysical Institute with special interest in high-energy astronomy, the science of detecting and analysing X-rays, gamma-rays and similar types of highly energetic electromagnetic radiation. This includes gamma-ray bursts from supernovae, some of the most powerful phenomena that we have observed in the entire universe.