The diverse works of architect Nicholas Hawksmoor (1661-1736) ranged from small architectural details to ambitious urban plans, from new parish churches to work on the monument of his age, St Paul's Cathedral. As a young man Hawksmoor assisted Christopher Wren and John Vanbrugh, emerging from these formidable apprenticeships to design some of the most vigorous and dramatic buildings in England. In this study, architectural historian Vaughan Hart examines both Hawksmoor's built and planned work. In addition, he explains Hawksmoor's theory of architecture.