ReganBooks

ReganBooks was an American bestselling imprint or division of the HarperCollins book publishing house (parent company is News Corporation), headed by editor and publisher Judith Regan, started in 1994 and ended in late 2006. During its existence, Regan was called, by LA Weekly, "the world's most successful publisher". The division reportedly earned $120 million a year. ReganBooks focused on celebrity authors and controversial topics, sometimes from recent tabloids.

From the Wikipedia article “ReganBooks”, licensed under CC BY-SA 4.0.

An imprint is a brand inside a larger publishing house, often with its own editors and list. Imprints of large groups usually acquire through literary agents; read recent titles to see whether your book fits the list, then target agents who sell to it.