
After another three novels with them, all with strong paranormal elements, she published three more with Manor Books in 1978, with a heavier emphasis on the occult.

Her first book sale was to Warner Paperback Library in 1974- The House That Samael Built, a Gothic romance. Jensen took up writing at an early age, and published over 200 short stories. They were married for over fifty years, until his death in 1999.

They moved to the Rogers, Arkansas area in the late 1950s. There she met her husband, Vaughn Jensen.

Jensen was born Ruby Jean Hendrickson in McDonald County, Missouri, where she spent her early years before moving with her family to Northern California. A "constant presence in Zebra's catalogue", she specialized in the "creepy child" or "child in supernatural peril" trope. Ruby Jean Jensen (Ma– November 16, 2010) was an American author of pulp horror fiction.
