Jerome Bruner was an influential American psychologist born in 1915. He received his PhD from Harvard in 1947 and taught there from 1952-1972, making important contributions to educational theory and practice. Bruner developed a constructivist theory of learning that emphasized how people actively construct new ideas based on previous knowledge and experience. He identified four major principles of learning: motivation, structure, sequence, and reinforcement. According to Bruner, intrinsic motivations like curiosity and a drive for competence are most effective for sustaining learning.