I am a professor of environmental history at Georgetown University. In my teaching and research, I bridge the humanities and the sciences to explore how societies have thrived - or suffered - in the face of dramatic changes in the natural world. I hope to glean lessons from the past that will help us confront our imminent future. I use public and digital histories to bring these lessons to journalists, policymakers, and the general public. 

In a forthcoming book, The Frigid Golden Age (Cambridge University Press), I explain how one society - the Dutch Republic - thrived as others faltered when volcanic eruptions and changes in solar radiation cooled Earth's climate between the sixteenth and eighteenth centuries. I am currently working on two new books: one that traces how environmental changes in outer space helped shape the course of human history, and another that unearths examples of societies that thrived amid natural and man-made climate changes over the past millennium.

I am the founder and director of HistoricalClimatology.com, a website that receives more than 300,000 hits annually. I am also the co-founder and co-director of the Climate History Network, an organization of nearly 200 academics in humanistic and scientific disciplines. I founded and now host the Climate History Podcast, and I am the secretary of the International Consortium of Environmental History Organizations.

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