In his research , he interviewed 37 psychiatrists , brain researchers , and philosophers on the subject of human potential .
In the middle of the 1960s , George Leonard did research across the United States on the subject of human potential for the magazine Look .
In George Leonard 's research , George Leonard interviewed 37 psychiatrists , brain researchers , and philosophers on subject subject of human potential .
In the middle of the 1960s , George Leonard did research across the United States on the subject of human potential for the magazine Look .