Rolf Dobelli is a Swiss author and businessman. He began his writing career as a novelist in 2002, but he is best known internationally for his bestselling non-fiction The Art of Thinking Clearly (2011, English 2013), for which The Times has called him "the self-help guru the Germans love".
An attempt at a twist on the self help genre which, rather than telling you "do this good thing if you want good results" says "do this bad thing if you want bad results" and then follows up with "actually don't, do the good thing for good results instead" which, sure, is out of the ordinary but all it really does is double the amount of text. I have a hard time believing much of the advice will be news to anyone either, if someone reads "don't become an alcoholic and don't become a drug addict because those things are bad for you" and sees it as new and never heard of transformational life advice then good for them, I guess.
Three stars because despite the double format bloat there's still very little in there that I could argue with, and even so the arguments would mostly revolve around semantics rather than disputing central points of chapters.