Her expert multi-lingual skills had her sidelining as a dialect coach
throughout much of her career. She worked with John Wayne on his Swedish
accent and Thomas Mitchell on his Irish in The Long Voyage Home (1940).
Was once a newspaper photographer.
After retiring from the screen, she served on the foreign film
selection committee for the Academy of Motion Picture Arts & Sciences.
Because she was often confused with Ilona Massey and Ona Munson, she changed her stage name to "Stefanie Paull" for one movie,
but reverted back to Osa Massen for her next film.
Married three times, her last husband was a dentist. Her first and third marriages ended in divorce; her second with her husband's death.
She met second husband Dr. Harvey Cummins while volunteering for the Red
Cross. He was involved in army medical work. They married in 1947 but
he died only 3-1/2 years later.