Diamond argues that individual leaders are essentially 'history's slaves' and do not change the course of events on their own. ^[1] Jared Diamond, an 88-year-old anthropologist and author of 'Guns, Germs, and Steel,' published his final book titled 'Profits, Prophets, Coaches, and Kings' through Mariner Books. ^[2] Diamond claims Genghis Khan succeeded because he lived through the wettest decades on the Mongolian steppe in 2,000 years, which supported his livestock and horses. ^[3] Only two major 20th-century politicians, Lee Kuan Yew of Singapore and Nelson Mandela, stepped down voluntarily from power. ^[4] Diamond proposes a 'Hamlet test' to scientifically prove that William Shakespeare was uniquely impactful by comparing his work to that of other Elizabethan playwrights. ^[5] Jared Diamond, author of Guns, Germs, and Steel, argues in his new book Profits, Prophets, Coaches, and Kings that leaders other than dictators must be skilled at leading group discussions. ^[6] The reviewer argues that Diamond's method is flawed because it ignores unknown writers whose work may have never been published or recorded. ^[7] The reviewer notes that Diamond's work attempts to find a middle ground between the 'Great Man' theory of history and the belief that environmental forces determine events. ^[8]