Jayne Ann Castle was born in Borrego Springs, California. Her mother, Alberta Castle, raised her with her two brothers, Stephen and James. In 1970, she obtained a B.A in History at the University of California, Santa Cruz, and later she obtained a Masters degree in Library Science from San Jose State University, where she met Frank Krentz, an engineer. After her graduation, they married and moved to the Virgin Islands. She worked in the Duke University library system, where she began to write her first romance novels. The marriage moved to Seattle, Washington, where they continue living.

Now, Jayne Ann Castle Krentz with her seven pennames is considered a pillar in the contemporary romance genre.