Rasmus Dahlberg is a disaster researcher and historian who has written a wide range of books on topics such as disasters, counterfactual history, and the Cold War, including the works Anvendt historie (Applied History), Det vidste du ikke om Danmark (Things You Didn't Know About Denmark), and Danmarks katastrofer (Denmark's Disasters).

As a disaster historian, he has specialized in studying and analyzing disasters and tragedies throughout history. But he is equally engaged in counterfactual history, where he explores how alternative decisions and events could have changed the course of the history of disasters.

His work is not only about understanding the past, but also about drawing out the valuable knowledge from historical disasters that can improve future preparedness.