Jerome Bruner was an American psychologist born in 1915 who received his PhD from Harvard. He is known for developing discovery learning and constructivist learning theories. Some key principles of Bruner's theory include that any subject can be taught effectively in some form to any learner, and that learning should involve active engagement through different modes of representation including enactive, iconic, and symbolic. Bruner believed learning is an active process in which students construct new ideas based upon their current and past knowledge through discovery and interaction.