Amanda Quick
Wikipedia says,
Jayne Ann Krentz, née Jayne Castle (b. March 28, 1948 in Cobb, California, USA), is an American writer of romance novels. Krentz is the author of a string of New York Times bestsellers under seven different pseudonyms. Now, she only uses three names. Under her married name she writes contemporary romantic-suspense. She uses Amanda Quick for her novels of historical romantic-suspense. She uses her maiden name for futuristic/paranormal romantic-suspense writing.
Over 35 million copies of Krentz’s novels are in print. With Sweet Starfire, she created the futuristic romance subgenre, and further expanded the boundaries of the genre in 1996 with Amaryllis, the first paranormal futuristic romantic suspense novel. She is an outspoken advocate for the romance genre and has been the recipient of the Susan Koppelman Award for Feminist Studies.
Sally Quilford
Sally Quilford has been writing since 1995, and since then has had 17 novels published by My Weekly Pocket Novels, People’s Friend Pocket Novels and Ulverscroft (Large Print). Sally writes mainly romantic intrigue, inspired by her love of Alfred Hitchcock films and Agatha Christie novels.
The Link
Both authors write romance and both names are pen names. Amanda Quick, like many others, used different names for different genres. This makes it easier for readers who are looking for a particular genre and expect authors to stick to one genre. I’m not sure it’s usually so necessary, although if a writer wrote both children’s literature and erotica, I think they’d be wise to use different names!
Sally had a different reason for deciding on a pen name: “It helped me to escape into other worlds and to say things that my alter ego, Tracy, dare not. As the years have passed, however, the demarcation lines between Sally and Tracy have blurred, and so I can say for definite that becoming a writer has given me the confidence to find my true ‘voice’.”
Miriam Drori, Author 