1921 – 1975
Eric Lenneberg (1921–1975) was a German-American linguist and cognitive scientist whose work established the biological foundations of language acquisition. He is best known for the Critical Period Hypothesis, arguing that language must be acquired during a biologically constrained developmental window. His nativist framework influenced subsequent debates on language innateness, poverty of the stimulus, and the learnability of grammar.
Formulated the Critical Period Hypothesis for language acquisition
Authored Biological Foundations of Language (1967), a landmark in biolinguistics
Argued for the genetic and neurological basis of universal grammar
Advanced learnability arguments showing grammatical knowledge cannot be fully derived from primary linguistic data alone
Contributed to the synthesis of linguistics, neuroscience, and developmental biology