From the age of 10, he sang in the choir of Salomon Sulzer, and in 1859, became an assistant cantor in Fünfhaus, one of the suburbs of Vienna (now a part of Rudolfsheim-Fünfhaus, the 15th Viennese district).
Kaiser arrived in New York City in June 1866, and in the following month was appointed cantor of the Oheb Shalom congregation in Baltimore, Maryland.
From 1895, he was an honorary member of the Central Conference of American Rabbis, which in 1892 entrusted him and William Sparger with the compilation of the musical portion of a Union Hymnal, published in 1897.
With Samuel Weltsch, Moritz (Morris) Goldstein, and J. L. Rice, Kaiser published the "Zimrat Yah" (1871–86, 4 vols.
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