Jordan Peterson was a relatively unknown clinical psychologist and University of Toronto professor until his brave 2016 challenge to a draconian Canadian law on transgender pronouns drew widespread attention. Millions watched his brilliant, wide-ranging YouTube lectures about life, truth, feelings, personality, and values. For a while there he seemed ubiquitous, giving interviews and lectures around the world and, in the process, becoming the planet's most famous living public intellectual. He published a massive bestseller, 12 Rules for Life. Then, suddenly, he disappeared. For the last two years he's been in medical hell, experiencing torturous pain and being brought to the...