What year was the author of The Art of Thinking born?
Rolf Dobelli Rolf Dobelli (born July 15, 1966 in Luzern, Switzerland) is a Swiss author and businessman.
Richard Lederer Richard Lederer (born May 26, 1938) is an American author, speaker, and teacher. He is best known for his books on the English language and on word play such as puns, oxymorons, and anagrams. He refers to himself as "the Wizard of Idiom," "Attila the Pun," and "Conan the Grammarian." His weekly column, "Looking at Language", is syndicated in newspapers and magazines throughout the United States.