Who Was Walt Disney?

My 9 year old son loved this book. This was one of three he read in the series. Walt Disney, Neil Armstrong and Albert Einstein. Each were great reads and he loved the information he got from the books. I enjoyed him reasing it out loud to me the second time he read it. My sons 4th grade class was assigned a biography book to read and report on. There was plenty of information as far as where they were born, how they accomplished what they each did and some sideline info on each of them that was interesting. However, the size of the words to a page and the difficulty would be more appropriate for 3rd grade not 4th.