My research explores the history of geopolitics. My first book, 'Cryptic Concrete' (2018, Wiley), examines West Germany's military landscapes, designed in the 1950s and 60s to protect and take life in nuclear war. 'Life, earth, colony' (University of Michigan Press, 2023) surveys the life, ideas and reception of Friedrich Ratzel (1844-1904), the controversial theorist of living space.