Mercer's review of Tribe of Mentors: Short Life Advice from the Best in the World by Steven Pressfield, Soman Chainani, Neil Strauss, Veronica Belmont, Annie Duke, Arianna Huffington, Gary Vaynerchuk, Tim O'Reilly, Brené Brown, Mike D., Kevin Kelly, Eric Ripert, Sharon Salzberg, Ray Dalio, Jacqueline Novogratz, Linda Rottenberg, Caroline Paul, Evan Williams, Chris Anderson, Neil Gaiman, Marie Forleo, Steven Pinker, Gretchen Rubin, Jocko Willink and Kristen Ulmer