German theologian, born in Switzerland, became, after a pastorate at Schaffhausen, professor first at Basel and then at Heidelberg; was a man of liberal principles, and was zealous for the union of the Protestants, Lutheran and Reformed, in one body on a broad basis; is noted as author of a work entitled "Das Characterbild Jesu," being an attempt to construe the character of Christ on rationalistic lines (1813-1885).