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Robert Letham is a Presbyterian minister with twenty-five years of pastoral experience. He was formerly a professor of Systematic and Historical Theology and now serves as senior research fellow at Union School of Theology in the UK. He is also associate professor at the Vrije Universiteit Amsterdam and a fellow in History and Theology at Greystone Theological Institute. He has written many books, including Systematic Theology, The Holy Trinity,, and The Holy Spirit.