Who is Reinhold Messner from The Crystal Horizon Everest-the First Solo Ascent and what is their importance?

The author, Reinhold Messner, is at the center of this book although he willingly shares the stage with Mount Everest. Above all else, Messner comes across as a driven man. He admits that even he does not fully understand why or how he manages to persevere in the face of exhaustion and fear.