- ,  Sunday, April 27, 2003 12 AM
                                
                            
                        
 
                    
                        
                            Mary Lou Quinlan worked her way up the corporate ladder for 20 years, becoming one of the few women to be named president and chief executive of a major Madison Avenue advertising agency. But for Ms.
Quinlan, a usually upbeat 49-year-old, the achievement turned out to be a hollow victory.
                        
                    
                    
                        
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