Well, he can't, as he is dead, but I am sad to hear allegations that Stephen Ambrose made up interviews with Dwight Eisenhower. These purportedly fake interviews were essential to his books on Eisenhower. The New Yorker has the details. Yahoo has an overview of the coverage. I imagine people will now pore over his books to find more examples of dodgy research. This makes me sad as I have greatly enjoyed many of his books.