Each community has its Rabbi. See also:
Unlike other religions, Judaism is not centralised and there is no one leader.
There is no current leader of Judaism.
There is no leader of the Judaism religion.
Abraham is known as the father of Judaism, but there is no person known as "the leader of Judaism".
Judaism is not a centralised religion and does not have a single leader.
In ancient times, the Jews had kings and high priests. Since the year 70 CE, there has been no single leader of the Jews.
Judaism has not had one central religious leader in almost 2,000 years.
There hasn't been a religious leader of all Judaism in roughly 1600 years.
Abraham
Abraham.
Rabbi
A Rabbi or a Cantor (or anyone for that matter) can interpret and teach the laws of Judaism.