A mentor is an advisor and support for someone less experienced. This is not a manager, but rather a specific relationship designed to build up the skills and experience of the mentee.
Dietrick Bonhoeffer (1906-1945) was a German pastor, theologian and anti-Nazi dissident. He was opposed to Hitler’s genocide of the Jews, and ran “underground seminaries” during the war. In 1943 he was imprisoned by the Gestapo. Bonhoeffer was executed in the spring of 1945.