LOEB, Leo, American pathologist: b. Germany, 21 Sept. 1869. He received his education at the universities of Heidelberg, Berlin, Zürich and Freiburg (1889-96) and in 1903 was research Fellow at McGill University, Montreal. In 1900-01 he was adjunct professor of pathology at the University of Illinois; in 1902 experimental pathologist of the New York State Pathological Laboratory at Buffalo; in 1904-10 assistant professor of experimental pathology at the University of Pennsylvania; in 1910-15 director of the department of pathology of the Barnard Skin and Cancer Hospital, Saint Louis, and since 1915 professor of comparative pathology at Washington University. Professor Loeb is fellow or member of many scientific societies and is a contributor, chiefly on tissue and tumor growth, physiology of generative organs, pathology of circulation, venom of Heloderma, etc., to professional journals.