Reader in Welsh and Atlantic History, Aberystwyth University, Wales. Serves as curate in the Church in Wales. Author of 'A Glorious Work in the World: Welsh Methodists and the International Evangelical Revival, 1735-50', co-author of 'The Elect Methodists: Calvinistic Methodism in England and Wales, 1735-1811'; editor of 'Religions in Wales: 1700 to the Present'; co-editor of 'Engaging with Martyn Lloyd-Jones' (Apollos), 'Evangelicalism and Fundamentalism in the United Kingdom during the Twentieth Century' (OUP); contributor to 'The Emergence of Evangelicalism' (Apollos).