Violinist; born at Deventer, Holland, and entered the Leipsic Conservatory in 1848 as a violin pupil of David. He played for some years as a first violin in the Gewandhaus Orchestra; from 1869 to 1873 was viceconductor, succeeding Dreyschock; and on David's death in 1869 succeeded him as leader of the orchestra. In the same year he became teacher of the violin in the Conservatory. He married the daughter of Klengel, who at one time had occupied the same post. He died at Leipsic. Roentgen was considered an excellent player; but Ehrlich speaks of his edition of Beethoven's quartets, an especially fine work, as being even a greater claim to fame than his playing, as he never toured in concert.