Central to the Irish community in Britain was the community's relationship with the Roman Catholic Church, with which it maintained a strong sense of identity. The Church remains a crucial focus of communal life among some of the immigrant population and their descendants. The largest ethnic group among the Roman Catholic priesthood of Britain remains Irish (in the United States, the upper ranks of the Church's hierarchy are of predominantly Irish descent). The former head of the Roman Catholic Church in Scotland is Cardinal Keith O'Brien.