In business
Started:1980
Ceased:
Tor Books is an Imprint of Tom Doherty Associates, LLC which publishes popular fiction, and is particularly noted for its science fiction and fantasy titles.
For a full history of the imprint and the people behind it see https://www.fundinguniverse.com/company-histories/Tom-Doherty-Associates-Inc-Company-History.html
Started publishing 1980