Rebecca Hunt has been named editor at Harlequin nonfiction. She was previously the associate editor at Penguin Books.
Sonya Cheuse has joined Grand Central as associate director of publicity. She was previously with Viking/Penguin.
At Knopf Books for Young Readers, Melanie Cecka is associate publishing director. She was most recently publishing director at Bloomsbury Children's Books. Also at Knopf, Stephen Brown is now editorial assistant.