Josef Matthias Hauer (March 19, 1883 – September 22, 1959) was an Austrian composer and music theorist. He is most famous for developing, independent of and a year or two before Arnold Schoenberg, a method for composing with all 12 notes of the chromatic scale. Hauer was also an important early theorist of twelve-tone music and composition.
Josef Matthais Hauer was 76 years old when he passed away in Austria, he is remembered solely for his work on developing a method for composing with all 12 notes of the chromatic scale. He accomplished this 1 or 2 years before Arnold Schoenberg. He was important early in his career as a theorist of twelve-tone music and composition.
The paragraph doesn't say where he lived when he passed away nor does it indicate what he is best remembered for or at what point in his career he was an important early theorist of twelve-tone music and composition.