Mark Harrison is an economic historian whose research examines the political economy of state systems, war, and comparative communism. He is the author of *Secret Leviathan: Secrecy and State Capacity under Soviet Communism*, published by Stanford University Press in 2023, which investigates how secrecy shaped governance, information flows, and administrative capacity in the Soviet Union. Drawing on archival sources and institutional analysis, Harrison’s work explores connections between secrecy, planning, and state performance across economic and military sectors. His scholarship has contributed to broader understandings of Soviet economic history, state institutions, and comparative systems of governance. Harrison has also published widely on topics including the economics of war, Soviet industrialization, and the role of expertise in planned economies, and he participates in academic research and teaching in economic history and related fields.