His last published work with opus appears to be Op.291 recorded in Monatsbericht (1928), p.209. Three additional works without opus appear in the years 1935, 1938, and 1943 (perhaps reprints). VIAF also lists as either a pseudonym for, or having as a pseudonym, Max Werner.
According to the biography link, he published (organ) works as late as 1948. - R.P.
