https://en.wikipedia.org/wiki/Erich_K%C3%A4stner

Author. One of Germany's leading creators of children's fiction. His sharp observations and dry humor have made his books popular with adults as well as young people. Kastner's best-known novels are "Emil and the Detectives" (1929) and "Lottie and Lisa" (1949). Both have been filmed several times, the latter by Disney as "The Parent Trap" (1961 and 1998). Among his other works are "Anna Louise and Anton" (1931), "The Flying Classroom" (1933), and "The Little Man and the Little Miss" (1967). Kastner was born in Dresden. He served in the German Army during World War I, an experience that turned him into a lifelong pacifist. His books were banned under the Nazis and during the 1930s he was twice arrested by the Gestapo, though he managed to avoid imprisonment. In 1960 Kastner was awarded the Hans Christian Andersen Award for Lifetime Achievement in Children's Literature. He published an autobiography, "When I Was a Little Boy", in 1957. (bio by: LaDonna)

He also wrote "Notabene 1945: Ein Tagebuch (a diary)" describing his experiences in Berlin beginning in February 1945 in Berlin and ending in Bavaria in August of 1945, and "Der tägliche Kram (the daily stuff) 1945-1948"