Dr Sigrid Netherer is a Senior Scientist in the Institute of Forest Entomology, Forest Pathology and Forest Protection (IFFF) at the University of Natural Resources and Life Sciences, Vienna (BOKU), Austria. She has an international reputation for her expertise in risk assessment of bark beetles and other forest insect pests.

Dr Maartje Klapwijk is a Senior Lecturer in Forest Entomology at the Swedish University of Agricultural Sciences, Uppsala, Sweden. She is known for her research on population dynamics of native and invasive species affecting forests. She is Co-ordinator of the Entomology of the Research Group at the International Union of Forest Research Organizations (IUFRO).