Gretchen Rubin is a renowned American author and psychologist, born in 1966. Her work primarily focuses on personal habits, happiness, and self-improvement. Rubin's book 'The Happiness Project' has gained international acclaim, and through her research and practice, she helps readers explore how to achieve personal happiness.
Source: The Happiness Project (Revised Edition): Or, Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun