Writing historiography is one of the most self-revealing acts an art historian is likely to perform. That is probably why many eminent scholars have kept well away from it. To confront Giorgio Vasari’s personal prejudices, jealousies and hatreds, and silences and suppressions of fact is to come into critical conflict with the mainstream of art-historical interpretation—the lengthy, authoritative tradition of credence given to the biographer. Paul Barolsky found his own gentle and inimitable way around...