Harvey Karp is an American pediatrician and child development expert, best known for his work in promoting effective parenting techniques. He gained widespread recognition for his book, "The Happiest Baby on the Block," which offers strategies to soothe crying infants and improve sleep for both babies and parents. His methods emphasize understanding a baby's needs and creating a calming environment. In addition to his writing, Karp developed the Happiest Baby program, which includes a series of videos and classes for new parents. He is also a co-founder of SNOO, a smart bassinet designed to help babies sleep better. Karp's work has influenced many parents and caregivers around the world.