Original: Burrhus Frederic Skinner ( March 20 , 1904 & ndash ; August 18 , 1990 ) was an American psychologist , author , inventor , social philosopher , Smith LD ; Woodward WR (/O1996/O) .
Simplified: Burrhus Frederic Skinner ( March 20 , 1904 -- August 18 1990 ) was an important American psychologist and author .