Wallace is an internationally recognized authority on Michelangelo and his contemporaries. In addition to more than forty articles (as well as two works of fiction), he is the author and editor of four books on Michelangelo: Michelangelo at San Lorenzo: The Genius as Entrepreneur (Cambridge 1994); Michelangelo: Selected Scholarship in English (Garland, 1996), Michelangelo: The Complete Sculpture, Painting, and Architecture (Hugh Lauter Levin, 1998), and most recently, Michelangelo: Selected Scholarship in English (Garland 1999). He is currently writing a new biography of Michelangelo.