Jonathan Henry Sacks, Baron Sacks, Kt is the Chief Rabbi of the United Hebrew Congregations of the Commonwealth. His Hebrew name is Yaakov Zvi.As the spiritual head of the United Synagogue, the largest synagogue body in the UK, he is the Chief Rabbi of the mainstream British orthodox synagogues, but not the religious authority for the Federation of Synagogues or the Union of Orthodox Hebrew Congregations or the progressive movements, Masorti, Reform and Liberal Judaism.
