Career
Born in Zagórów in the Russian Empire (today in Poland), Mazur received a religious education. In 1933 he was elected president of the Warsaw Jewish community, a role he held until 1938. He also served as president of the Wise Men of Lublin yeshiva between 1934 and 1939.
In 1940 he made aliyah to Mandatory Palestine, where he established a diamond company in Tel Aviv.
He narrowly missed out on a seat in the elections for the first Knesset in 1949, but entered the parliament when Moshe Kelmer resigned on 11 March that year. However, he lost his seat in the 1951 elections.