Peter O'Donnell Professions : Writer Born : April 11, 1920 Died : May 3, 2010 Browse All Authors Famous Quotes by Peter O'Donnell Anger and worry are the enemies of clear thought. Peter O'Donnell clear worry enemy Similar Authors Ihab Hassan writer Ingmar Bergman writer Isabella Bird writer Ivan E. Coyote writer Al Feldstein writer Bert Sugar writer All Authors