- Born
- Died
- Birth nameMary Thompson
- Mary O'Brien was born on February 13, 1906 in Texas, USA. She was an actress, known for Battling Butler (1926), It Must Be Love (1926) and The Rich Pup (1924). She died on April 30, 1996 in Los Angeles, California, USA.
- Mother of Three Dog Night keyboardist Jimmy Greenspoon.
- Pursued romantically by Douglas Fairbanks Jr. Although she wasn't interested in Fairbanks, she then introduced him to her then roommate Joan Crawford, and the rest is history.
- Roomed with Joan Crawford upon moving to Hollywood.
- Grandmother of keyboardist Jim Greenspoon.
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