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