It is official and also translated as "Longman Publishing Group Company". British publishing agency. 1724 was founded in London by Thomas Langmann (1699- 1755) and named as "Longman Publishing House". 1947 changed its name to "Longman-Green Publishing House". 1968 changed its name. At first, it mainly published English textbooks and dictionaries, and then gradually expanded its scope, involving teenagers' books, literature books, and professional books and periodicals such as computer, engineering, law, economy, commerce and medicine. 1968 was acquired by Pearson PLC, a large British media organization, so it was sometimes named "Pearson Longman". 1988 Acquisition of Addison-Wesley Company.