Jan Jesenský Jr. (1904–1942) was a scientist and collaborator of Professor Jan Jesenský at Prague Stomatologic Clinic, assistant professor at Prague University. Jesenský was born in Prague. After the occupation of Czechoslovakia by Hitler, he became a member of a secret military resistance organisation. In 1942 he was arrested by the Gestapo and tortured to death in the Mauthausen concentration camp, Austria. Jesenský was a cousin of Milena Jesenská. See also House of Jeszenszky 1904 births 1942 deaths Czechoslovak civilians killed in World War II People who died in Mauthausen concentration camp Scientists from Prague Czech scientists People executed by torture Czech people executed in Nazi concentration camps Czech resistance members