Gustav Mahler was an Austrian composer and conductor of the 19th and 20th centuries. The second movement from his Symphony Number One was played on the ship-wide comm when Kashyk came aboard USS Voyager in 2375. (VOY: "Counterpoint")
The opening of Mahler's Symphony Number One was quoted in Alexander Courage's Star Trek theme.
According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 12), the birth and death years for Gustav Mahler were 1860 and 1911, respectively.