Carmel Mothersill is a Professor and Canada Research Chair of Environmental Radiobiology at McMaster University in Canada. Her research interests are the biological effects of low dose radiation on non-human biota with a special interest in developing methods to study impacts at the population and ecosystem level.Gayle Woloschak is Professor of Radiation Oncology and Associate Dean in The Graduate School at Northwestern University. Her research interests center around low dose radiation biology, X-ray fluorescence microscopy, and nanotechnology.Francois Brechignac is a retired environmental scientist who worked in IRSN France. He was president and General Secretary of the International Union of Radioecologists for many years and is currently a vice-president. His particular interests are in the development o ecosystem level approaches in radiation protection.Andrea Bonisoli-Alquati is Associate Professor of Environmental Toxicology at Cal Poly Pomona, in California. His research in the context of radioecology uses field studies, and molecular and biomarkers approaches to investigate natural variation in sensitivity and response to low dose radiation in wild populations of animals, with particular interest in birds.