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.
Joseph Beuys Joseph Beuys (] ; 12 May 1921 – 23 January 1986) was a German Fluxus, happening, and performance artist as well as a sculptor, installation artist, graphic artist, art theorist, and pedagogue.