Gretchen Rubin is the author of several books, including the New York Times bestsellers The Four Tendencies, Better Than Before, The Happiness Project, and Happier at Home. She has an enormous readership, both in print and online, and her books have sold three million copies worldwide, in more than thirty languages.

On her popular weekly podcast, Happier with Gretchen Rubin, she discusses good habits and happiness with her sister Elizabeth Craft; they've been called the "Click and Clack of podcasters." Her podcast was named in iTunes's lists of "Best Podcasts of 2015" and was named in the Academy of Podcasters "Best Podcasts of 2016."

Fast Company named Gretchen Rubin to its list of Most Creative People in Business, and she's a member of Oprah's SuperSoul 100.

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Past guests on The Tim Ferriss Show include Jerry Seinfeld, Hugh Jackman, Dr. Jane Goodall, LeBron James, Kevin Hart, Doris Kearns Goodwin, Jamie Foxx, Matthew McConaughey, Esther Perel, Elizabeth Gilbert, Terry Crews, Sia, Yuval Noah Harari, Malcolm Gladwell, Madeleine Albright, Cheryl Strayed, Jim Collins, Mary Karr, Maria Popova, Sam Harris, Michael Phelps, Bob Iger, Edward Norton, Arnold Schwarzenegger, Neil Strauss, Ken Burns, Maria Sharapova, Marc Andreessen, Neil Gaiman, Neil de Grasse Tyson, Jocko Willink, Daniel Ek, Kelly Slater, Dr. Peter Attia, Seth Godin, Howard Marks, Dr. Brené Brown, Eric Schmidt, Michael Lewis, Joe Gebbia, Michael Pollan, Dr. Jordan Peterson, Vince Vaughn, Brian Koppelman, Ramit Sethi, Dax Shepard, Tony Robbins, Jim Dethmer, Dan Harris, Ray Dalio, Naval Ravikant, Vitalik Buterin, Elizabeth Lesser, Amanda Palmer, Katie Haun, Sir Richard Branson, Chuck Palahniuk, Arianna Huffington, Reid Hoffman, Bill Burr, Whitney Cummings, Rick Rubin, Dr. Vivek Murthy, Darren Aronofsky, and many more.

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Trippus Event Solutions' Martin Klofver on Event Tech Trends