There are 2 books in the Piers Knight series. The newest book is Central Park Knight which came out in 2011.

Professor Piers Knight, an esteemed curator at the Brooklyn Museum, is regarded by many on the staff as a revered institution of his own, if not an outright curiosity. Knight's portfolio includes lost civilizations; arcane cultures, languages, and belief; and, more than a little bit of the history of magic…
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Central Park Knight

Book cover of Central Park Knight
Professor Piers Knight is the Brooklyn Museum's very own Indiana Jones. His specialties include lost civilizations, arcane cultures, and more than a little bit of the history of magic and mysticism. What his contemporaries don't know is that he is also proficient in the uses of magical artifacts. Knight receives…