Nicolas Werth is a French historian known for his expertise in Soviet history and the study of totalitarian regimes. He has contributed significantly to the understanding of the Soviet Union and its impact on Eastern Europe, particularly during the Stalin era. His research often focuses on political repression and the mechanisms of state control. Werth is also recognized for his work on the Holodomor, the man-made famine in Ukraine during the early 1930s. He has published several books and articles that analyze the causes and consequences of this tragic event, shedding light on the broader implications of Soviet policies on human rights and society.