- Los Angeles, CA, USA: Is retired from acting and directing his own photography company "A. O'Brien Photography". (2011)
- As a kid he appeared in commercials for "Circuit City" in which he gets money back for a Walkman he purchased and it went on sale a week later and he says to the cashier: "Cool".
- Austin and his wife Kristin welcomed a son named Declan Rhys, born at 8:09am on November 15, 2013. The baby weighed 7lbs 10oz and was 21.5 inches long.
- Brother of Trever O'Brien
- Attending Azusa Pacific University. Majoring in Music.
- Has appeared in two films to feature La Brea Tar Pits, Last Action Hero (1993) and My Girl 2 (1994).
- Has a sister named Amanda.
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