I spent 15 years studying invasive species, particularly those that cause tree diseases. Now I am working to make sure that the best available science is used to prevent new insect pests and diseases from getting spread around the world. I love to travel, and this mission has taken me to 10 different countries. Scientists everywhere think this work is important, but other authorities have to balance our concerns about pests with the benefits of free trade. There are still many important questions that need answers.