Who is this William De Tucci ?
Here's what he posted for a bio on lulu:
William J. DeTucci is an expert Scholar, Theologian and Historian within Roman Catholicism. He has appeared on Catholic Television and has written numerous books, tracts, articles and pamphlets on Roman Catholicism. At the moment he is at work on a book concerning the 1054 A.D. schism and its aftermath in light of East and West.
Maybe he could add something to support "expert Scholar, Theologian and Historian"?
I'm not looking to be adversarial but I think it's a reasonable expectation.