Professor Jaynie Anderson, University of Melbourne, author of Tiepolo's Cleopatra (Palgrave Macmillan, 2003); Judith (Éditions du Regard, 1997); Giorgione: The Painter of Poetic Brevity (Flammarion, 1997). More information on Professor Anderson is here.
Professor John Ganim, University of California-Riverside, author of Medievalism and Orientalism (Palgrave Macmillan, 2005), Chaucerian Theatricality (Princeton UP, 1990), and Style and Consciousness in Middle English Literature (Princeton UP, 1983); President of the New Chaucer Society. This site has more information and a nice picture.
Dr Vanessa Harding, Birkbeck College London, author of A Short History of Early Modern London (Cambridge UP, 2005); The Dead and the Living in London and Paris, 1500-1670 (Cambridge UP, 2002). Channel 4 has an interview with Dr Harding on the plague in medieval London; here is her staff page at Birkbeck.
Professor David Wallace, University of Pennsylvania, author of Premodern Places (Blackwell, 2005); The Cambridge History of Medieval English Literature (ed.; Cambridge UP, 1999); and Chaucerian Polity: Absolutist Lineages, Associational Forms in England and Italy (Stanford UP, 1997), winner of the Modern Language Association's James Russell Lowell Prize. Here is Professor Wallace's home page where you can also read a recent interview in Penn's Arts and Sciences magazine and see a cartoonist's rendition of the man.