Buy 3, pay for 2 — use code TRIPLEUS at checkout. Get 5% off with the code WELCOME5 Billy L. White dedicated his career to in-depth research on child development. He is the author of the seminal work The first three years of life. His work has been essential for understanding developmental psychology in early childhood. Throughout his career, he has published a total of 27 specialized works. His academic focus was closely linked to the prestigious Harvard Preschool Project. 
