Ethel was born in San Francisco, California, to Valentin LaPlanche and Katherine Riley.
She began working as a stenographer at a film studio in her teens, according to census records.
In her professional life, she went by the name Ethel La Blanche.
In the late 1930s and early 1940s, she wrote a string of B-movies, including Pirates on Horseback, Flirting with Fate,[1] and Exile Express.
This article about an American screenwriter born in the 1900s is a stub.