Who edited J.R.R. Tolkien's twelve-volume The History of Middle-earth after Tolkien's death?

Christopher Tolkien edited J.R.R. Tolkien's twelve-volume The History of Middle-earth after Tolkien's death.

The series was published between 1983 and 1996. Christopher Tolkien examined drafts, revisions, abandoned versions, notes, and other papers to trace the development of his father's mythology from its earliest forms to material related to The Lord of the Rings.

The books are not a single polished narrative. They present changing versions of characters, places, languages, and events, with editorial commentary explaining how Tolkien's ideas evolved. This makes the series especially valuable for readers studying the creative history behind Middle-earth.

Christopher Tolkien was Tolkien's third son and also served as literary executor. He should not be confused with Rayner Unwin, the publisher involved with Tolkien's books, or Humphrey Carpenter, whose major contribution was a biography of Tolkien.