[3] He is the son of Alexander Werth, a Russian born British journalist and writer who lived in the USSR during World War II.

[4] Nicolas Werth has taught abroad (Minsk, New York, Moscow, Shanghai).

[5] His research has focused, among other things, on state violence and social resistance in the years 1920–1930.

[6] He wrote the chapters dedicated to the USSR in The Black Book of Communism.

[7] He was the historic consultant for the French television documentary film, Staline: le tyran rouge, broadcast on M6 in 2007, and is co-author with Patrick Rotman and François Aymé of Gulag, The Story, broadcast on Arte in 2019.