Thompson is one of the world's foremost authorities on paleoclimatology and glaciology. For over 40 years, he has led 60 expeditions where they conduct ice-core drilling programs in the Polar Regions as well as on tropical and subtropical ice fields in 16 countries including China, Peru, Russia, Tanzania and Papua, Indonesia (New Guinea). He and his team from the Ohio State University have developed light-weight solar-powered drilling equipment for acquisition of histories from ice fields in the tropical South American Andes, the Himalayas, and on Mount Kilimanjaro in Tanzania. The results from these paleoclimate histories were published in more than 230 articles and have contributed toward improved understanding of Earth's climate system, both past and present.