James Clear

James Clear spent years writing about habits and decision-making on his own site before Atomic Habits appeared in 2018. The book gathered that work into one argument, that small, repeatable improvements compound, and it became one of the best-selling non-fiction books of its decade, translated into dozens of languages and read far outside the self-help shelf, in companies, schools and sports teams.

His influence is less about new research than about clarity. Clear reads the behavioral science, borrows openly from it, and turns it into rules a reader can act on the same day: make it obvious, attractive, easy and satisfying. His weekly newsletter continues the same practice of short, usable ideas.