Featured series 
Tag: Calder Walton
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Nation & World
How climate change will impact national security
The assistant director of research at the Belfer Center’s Intelligence Project, Calder Walton talks about the recent U.S. intelligence report on the national security implications of
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Nation & World
Climate change as a national security issue
Former Secretary of State Kerry calls climate change one of the biggest threats facing the nation.
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Nation & World
It’s spy vs. spy vs. spy
Newly named general editor of a book project documenting espionage and intelligence throughout human history, Harvard Kennedy School senior fellow Calder Walton discusses the context of the FBI’s investigation into President Trump’s connections to Russia and how spies and spying have evolved over centuries.
