Jonathan Seth Kellerman is an American novelist, psychologist, and Edgar- and Anthony Award-winning author best known for his popular mystery novels featuring the character Alex Delaware, a child psychologist who consults for the Los Angeles Police Department.
His first published novel, When the Bough Breaks, appeared in 1985, many years after writing and having works rejected. He then wrote five bestselling novels while still a practicing psychologist. In 1990 he quit his private practice to write full-time. He has written more than 40 crime novels, and well as non-fiction works and children's books.