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Leonard Eron

In 1965, Leonard published the seminal book with colleagues Joseph Zubin and Florence Schumer on the projective testing. Leonard was concerned about the increased of the aggressive behavior in between the youths in America. Leonard argued with Seymour Sarason who is Leonard's mentor and role model. They argued that to really contributed in child psychology, they should get into the community not the laboratory, and Leonard agreed with his advice. In 1955, Leonard cut down his time in Yale and set a position as a director and chief psychologist at the Rip Van Winkle Clinic in Columbia County, New York, A precursor of community mental health centers. And began one of the longest running studies: the Columbia County Longitudinal Study.

In the first part of the study, Leonard and his staffs interviewed 856 children, the entire third grade of Columbia County, and 80% of their mothers and fathers. The study was trying to find if there a relationship between children's aggressive behavior in school with child rearing practices of the parents. And resulted that the punishment at home increased the child's aggression at school, particularly if the child did not identify with the parent doing the punishing.

Leonard and his colleague also found out that theres relationship between with the aggressiveness of the boys they studied and the violence of their favorite TV shows, this made Leonard concerned that the media violence are affecting the children.

In 1970s, Leonard's concluded that the media violence causes aggression, and published in the American Psychologist.