The lengthiest biography, "Schulz and Peanuts: A Biography" (2007) by David Michaelis, has been heavily criticized by the Schulz family; Schulz's son Monte stated it has "a number of factual errors throughout  ... factual errors of interpretation" and extensively documents these errors in a number of essays. However, Michaelis maintains that there is "no question" his work is accurate. Although cartoonist Bill Watterson (creator of "Calvin and Hobbes") feels the biography does justice to Schulz's legacy, while giving insight into the emotional impetus of the creation of the strips, cartoonist and critic R.C. Harvey regards the book as falling short both in describing Schulz as a cartoonist and in fulfilling Michaelis' stated aim of "understanding how Charles Schulz knew the world"; Harvey feels the biography bends the facts to a thesis rather than evoking a thesis from the facts. Dan Shanahan's review, in the "American Book Review" (vol 29, no. 6), of Michaelis' biography faults the biography not for factual errors, but for "a predisposition" to finding problems in Schulz's life to explain his art, regardless of how little the material lends itself to Michaelis' interpretations. Shanahan cites, in particular, such things as Michaelis' crude characterizations of Schulz's mother's family, and "an almost voyeuristic quality" to the hundred pages devoted to the breakup of Schulz's first marriage.