Houghton Mifflin Company is a leaing educational publisher in the United States. The company's headquarters is located in Boston's Back Bay. It publishes textbooks, instructional technology materials, assessments, reference works, and fiction and non-fiction for both young readers and adults, including the Best American series (annual collections of previously-published fiction and non-fiction). The company is part of the Houghton Mifflin Riverdeep Group.