Jerome Bruner is an influential American psychologist known for his work on cognitive development and learning theory. Bruner's ideas were greatly influenced by Piaget's theory of developmental stages, and he emphasized the importance of language for cognitive growth. Some of Bruner's key concepts included scaffolding, whereby adults provide support to help children learn; formats and routines, which create predictable contexts for language learning; and a spiral curriculum where concepts are revisited at increasing levels of complexity. These ideas have been highly influential in education and language teaching.