Juliana Tainer, born Juliana O'Donnell, was a female Human scientist in the 24th century. She was the wife of Dr. Noonian Soong and treated their android creations, such as Data and Lore, as children.
After the Crystalline Entity attack on their colony, Juliana fell into a coma. Dr. Soong created an android in her image and transferred her knowledge and experiences. When she was activated, she was unaware she had become an android.