Gretchen Rubin is one of today's most influential and thought-provoking observers of happiness and human nature. She's the author of many bestselling books, including The Happiness Project. She discusses happiness and good habits with her sister on her podcast, Happier with Gretchen Rubin, and helps people track their happiness-boosting habits with her award-winning app Happier.

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Title: The Four Tendencies: The Indispensable Personality Profiles That Reveal How to Make Your Life Better (and Other People's Lives Better, Too), Author: Gretchen Rubin
Hardcover $22.49 $25.00 Current price is $22.49, Original price is $25.00.
Title: Outer Order, Inner Calm: Declutter and Organize to Make More Room for Happiness, Author: Gretchen Rubin
Hardcover $14.49 $16.99 Current price is $14.49, Original price is $16.99.
Title: Secrets of Adulthood: Simple Truths for Our Complex Lives, Author: Gretchen Rubin Pre-Order Now