Acquisition may refer to:

Stephen Krashen is professor emeritus at the University of Southern California, who moved from the linguistics department to the faculty of the School of Education in 1994. He is a linguist, educational researcher, and activist.

Dr. Krashen has published more than 350 papers and books, contributing to the fields of second language acquisition, bilingual education, and reading. He is credited with introducing various influential concepts and terms in the study of second language acquisition, including the acquisition-learning hypothesis, the input hypothesis, the monitor hypothesis, the affective filter, and the natural order hypothesis. Most recently, Krashen promotes the use of free voluntary reading during second language acquisition, which he says "is the most powerful tool we have in language education, first and second."

As education policy in Krashen’s home state of California became increasingly hostile to bilingualism, he responded with research critical of the new policies, public speaking engagements, and with letters written to newspaper editors. During the campaign to enact an anti-bilingual education law in California in 1998, known as Proposition 227, Krashen campaigned aggressively in public forums, media talk shows, and conducted numerous interviews with journalists writing on the subject. After other anti-bilingual education campaigns and attempts to enact regressive language education policies surfaced around the country, by 2006 it was estimated that Krashen had submitted well over 1,000 letters to editors.

Steven Anthony "Steve" Ballmer (born March 24, 1956) is the chief executive officer of Microsoft, having held that post since January 2000. As of 2012^[update], his personal wealth is estimated at $15.7 billion, ranking number 19 on the Forbes 400.

Ballmer was born in Detroit, Michigan to a Swiss American father and a Jewish American mother. He grew up in the community of Farmington Hills, Michigan. In 1973, he attended college prep and engineering classes at Lawrence Technological University and graduated from Detroit Country Day School, a private college preparatory school in Beverly Hills, Michigan, with a perfect score of 800 on the mathematical section of the SAT. He now sits on the school's board of directors. In 1977, he graduated magna cum laude from Harvard University with a A.B. in mathematics and economics.

At college, Ballmer managed the football team, worked on The Harvard Crimson newspaper as well as the Harvard Advocate, and lived down the hall from fellow sophomore Bill Gates. He then worked for two years as an assistant product manager at Procter & Gamble, where he shared an office with Jeffrey R. Immelt, who later became CEO of General Electric. In 1980, he dropped out of the Stanford Graduate School of Business to join Microsoft.

Avram Noam Chomsky (/ˈnoʊm ˈtʃɒmski/; born December 7, 1928) is an American linguist, philosopher,cognitive scientist, historian, and activist. He is an Institute Professor and Professor (Emeritus) in the Department of Linguistics & Philosophy at MIT, where he has worked for over 50 years. Chomsky has been described as the "father of modern linguistics" and a major figure of analytic philosophy. His work has influenced fields such as computer science, mathematics, and psychology.

Ideologically identifying with anarcho-syndicalism and libertarian socialism, Chomsky is known for his critiques of U.S. foreign policy and contemporary capitalism, and he has been described as a prominent cultural figure. His media criticism has included Manufacturing Consent: The Political Economy of the Mass Media (1988), co-written with Edward S. Herman, an analysis articulating the propaganda model theory for examining the media.

According to the Arts and Humanities Citation Index in 1992, Chomsky was cited as a source more often than any other living scholar from 1980 to 1992, and was the eighth most cited source overall. Chomsky is the author of over 100 books. He is credited as the creator or co-creator of the Chomsky hierarchy, the universal grammar theory, and the Chomsky–Schützenberger theorem.