It's "Animated Man: A Life of Walt Disney" by J. Michael Barrier.
Do you mean "Walt Disney: The Triumph of the American Imagination" by Neal Gabler?
Both had good Amazon reviews. I originally bought the book for my wife as she wanted a Disney biography. I did quite a bit of research on the best books and this one seemed to get very good reviews for being objective and balanced. Even the detractors say it is historically spot on acurate and very well researched.
I just discovered that Barrier's website has a listing of the errors in Gabler's book.