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Julius Wellhausen
Julius Wellhausen (17 May 1844 – 7 January 1918) was a German biblical scholar and orientalist. In the course of his career, he moved from Old Testament research through Islamic studies to New Testament scholarship. Wellhausen contributed to the composition history of the Pentateuch/Torah and studied the formative period of Islam. For the former, he is credited as one of the originators of the documentary hypothesis.
Source: Wikipedia