Ernst Klee (15 March 1942, Frankfurt – 18 May 2013, Frankfurt) was a German journalist and author. As a writer on Germany's history, he was best known for his exposure and documentation of medical crimes in Nazi Germany, much of which was concerned with the Action T4 or involuntary euthanasia program. He is the author of "The Good Old Days": The Holocaust Through the Eyes of the Perpetrators and Bystanders first published in the English translation in 1991. Source: Wikipedia (en)