Peter Hudson is a Willaman Professor of Biology at Penn State where he works on the ecology of spillover – both the process of spillover and how the infections invade novel hosts. He was one of the pioneers of wildlife disease ecology and has worked on pathogen and parasite systems in many parts of the world including Trentino. He has more than 300 publications on disease systems, was elected a Fellow of The Royal Society in 2008 and a co-founder of The Random Good Foundation which seeks to tell science stories to the general public for social change. During the MOOD international workshop in Trento, he gave a compelling presentation about "Science and Pre-emergent prevention". Following this presentation, he was asked a few questions regarding spillovers and pre-emergence prevention by MOOD's Working Package 8 OpenGeoHub's communication experts.