I have 20 years of experience in the field of cold regions and mountain infrastructure, and transportation technology, with specific knowledge of highway, airport and helicopter operations, snowmobile, ski and snowboard equipment, ski area facilities and operations and land and infrastructure development. I have published on such topics as snow and ice control on highways and airports, snow avalanches, landslides, rockfalls, snow loads on structures, snowplow, snowmobile, ski and snowboard equipment, ski area facilities and operations, National Environmental Policy Act (NEPA) environmental allowance (EA) and Environmental Impact Statement (EIS) criteria and requirements. I have testified 12 times on topics such as snow avalanche hazards, personal injury on snow and ice covered highways, and ski, snowplow and snowmobile equipment.