Who is Richard Glazar from the nonfiction book, Into That Darkness: An Examination of Conscience?

Richard Glazar is one of Franz Stangl's work colleagues. The author describes him as an excellent character witness. He is one of the Czech work-Jews at Treblinka. He is one of the very few to have escaped. There is one successful uprising that includes an escape and Richard and one of his best friends Karel are able to get out. He provides the author with a number of interviews. Amongst his many valuable observations and insights, he admits that Franz Stangl was not a sadist. Though he did not appear to shirk from his duties, he did not go out of his way to harm anyone beyond the gruesome necessity of his job.