Joseph Yasser

Joseph Yasser (April 16, 1893 – September 6, 1981) was a Russian–American organist, music theorist, author, and musicologist. An influential figure who established a handful of musical institutions, Yasser is noted for his 1932 publication, ''A Theory of Evolving Tonality''. He was active until his death at age 88 in 1981. Yasser was married but had no children. Provided by Wikipedia