 His principal research interests are in the history of politics, religion, and society in Great Britain from the eighteenth to the twentieth century, and in the history of the global evangelical movement.He was President of the Ecclesiastical History Society (2006–2007).Bebbington is widely known for his definition of evangelicalism, referred to as the "Bebbington quadrilateral", which was first provided in his 1989 classic study "Evangelicalism in Modern Britain