He founded the Bach-Archiv Leipzig on 20 November 1950 and was a principal editor of the Neue Bach-Ausgabe, the second edition of the complete works of Johann Sebastian Bach.
After the Deutsche Bachfeier 1950, the bicentennial of Bach, he founded the Bach-Archiv Leipzig for documentation and research, which he presided until 1973, achieving international recognition.
From 1953 to 1974 Neumann was, together with Alfred Dürr, editor of the Bach-Jahrbuch (Bach almanach), writing several contributions himself.
[1][2] In 1974 Neumann became a member of the Sächsische Akademie der Wissenschaften [de], the Saxonian Academy of Sciences.
Neumann wrote liner notes, articles for magazines, reviews, essays, music editions.