sentences:  Leonard Eron
  
  Leonard David Eron (pronounced Ear- On) (April 22, 1920 – May 3, 2007) was an American psychologist who conducted one of the longest spanning longitudinal studies on aggressive behavior in children to date.Based on Leonard Eron and Rowell Huesmann's second longitudinal study that they conducted between 1977 and 1995, (the Cross-National Television Study) lead to the conclusion that media violence causes aggressive behavior.