Siobhan Finneran is a British actress known for her versatile performances in television and film. She gained widespread recognition for her role as O'Brien in the popular series Downton Abbey, where she portrayed a scheming maid. Finneran has also appeared in other notable productions, including Happy Valley and The Other One. Born on April 2, 1970, in Oldham, England, Finneran began her acting career in the late 1990s. She has received critical acclaim for her work, earning several awards and nominations throughout her career. Finneran continues to be a prominent figure in the entertainment industry.