Who invented the personal essay? That is hard to say. The ancient Roman philosopher and cynical power broker, Seneca? The 16th century French philosopher Montaigne certainly brought it to a peak of perfection. There were many 19th century masters, not so many after that. Who is the greatest living essayist writing in English? That requires no debate at all. It is unquestionably Joseph Epstein. He is not only the best living essayist; he is...