Tim S. Grover

Trained Michael Jordan for fifteen years, then Kobe Bryant and Dwyane Wade, and writes about the ones who cannot be satisfied rather than the ones who can be coached.

Relentless divides performers into coolers, closers and cleaners, and Grover is unambiguous that the third category is not pleasant to be around or to be. The book does not offer balance, and says so. It is best read as a description of a specific and costly temperament rather than as advice for a general reader, which is a distinction the marketing does not make.