Who is Steven Krashen?

Steven Krashen is a notable linguistics expert widely recognized for his significant contributions to the field of second language acquisition. His theoretical framework outlines how individuals acquire a second language, emphasizing the importance of exposure to comprehensible input. According to Krashen, language acquisition occurs best when learners are exposed to language input that is slightly above their current proficiency level, a concept known as "i+1."

His theories have heavily influenced educational practices, particularly in immersive language learning settings and bilingual education programs. By highlighting the role of motivation and the natural order of language acquisition, Krashen has provided educators with insights on how to support learners effectively in diverse language learning environments. This focus on second language acquisition distinctly positions him within the realm of linguistics, making the correct answer precise in identifying his primary expertise and contributions.