Before movies, radio, and television challenged the hegemony of the printed word, the Saturday Evening Post was the preeminent vehicle of mass culture in the United States.& And to the extent that a mass medium can be the expression of a single individual, this magazine, with a peak circulation of almost three million copies a week, was the expression of its editor, George Horace Lorimer.& Cohn shows how Lorimer made the Post into a uniquely powerful...