Sonja Lyubomirsky is a professor of psychology at UC Riverside and author of The How of Happiness, which outlines strategies backed by research for increasing happiness. The book suggests that 40% of happiness is subject to self-control, targeting behaviors like gratitude, kindness, and savoring good experiences. The document provides information about Lyubomirsky's work, a summary of her book's premise, and links to additional resources on subjective well-being from the AmAreWay website.