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He is a leading expert on the life and works of Claudio Monteverdi, and is the author of the books Duet and Dialogue in the Age of Monteverdi (Ann Arbor, Michigan: University Microfilms International, 1982) Monteverdi, 'Orfeo' (London: Cambridge University Press, 1986), Monteverdi, Vespers (1610) (Cambridge University Press, 1997), and The Cambridge Companion to Monteverdi (with Richard Wistreich, Cambridge University Press, 2007).