Many Presbyterian denominations have found ways of working together with other Reformed denominations and Christians of other traditions, especially in the World Communion of Reformed Churches.
Some Presbyterian churches have entered into unions with other churches, such as Congregationalists, Lutherans, Anglicans, and Methodists.
In fact, most Presbyterians found in England can trace a Scottish connection, and the Presbyterian denomination was also taken to North America, mostly by Scots and Scots-Irish immigrants.
The Presbyterian denominations in Scotland hold to the Reformed theology of John Calvin and his immediate successors, although there is a range of theological views within contemporary Presbyterianism.
Presbyterianism was especially influenced by the French theologian John Calvin, who is credited with the development of Reformed theology, and the work of John Knox, a Scotsman and a Roman Catholic Priest, who studied with Calvin in Geneva, Switzerland. The Presbyterian church traces its ancestry back primarily to England and Scotland.Above the sessions exist presbyteries, which have area responsibilities.These are composed of teaching elders and ruling elders from each of the constituent congregations.Presbyterians in the United States came largely from Scottish immigrants, Scots-Irish immigrants, and also from New England Yankee communities that had originally been Congregational but changed because of an agreed-upon Plan of Union of 1801 for frontier areas.the Culdees practiced Christian monasticism, a key feature of Celtic Christianity in the region, with a presbyter exercising "authority within the institution, while the different monastic institutions were independent of one another." Presbyterian history is part of the history of Christianity, but the beginning of Presbyterianism as a distinct movement occurred during the 16th-century Protestant Reformation.