Sylvia Rosen was born in 1933 in Toronto, Canada and raised in a small mill town in Massachusetts. When she was 13 her family moved to Springfield, Massachusetts, where her father worked in textiles and her mother was a housewife. Although neither of her parents attended college, Rosen was always expected to receive a formal college education. She attended Pembroke College in 1951, where she studied art history and French literature, and graduated in 1955. Three weeks after graduating from Pembroke she married her fiancé and college sweetheart, Sid Baumgarten. Together they had four children.
Rosen worked as a freelance interior decorator, and published crossword puzzles in The New York Times. When Rosen’s youngest child left the house for college, she began writing romance novels. She has published 14 historical romance novels under the pen names of Ena Halliday, Sylvia Halliday, and Louisa Rawlings, and is now an award-winning author.