Aún no disponemos de datos de Billy O\'Brien en la Base
Filmografía parcial 
| All -- Movies -- TVmovie-Video -- TV Episodes | ||
| - | ISOLATION (2005) [Element Films] | |
| ... Dirección, Guión | ||
| --<>-- | ||
| All -- Movies -- TVmovie-Video -- TV Episodes | ||
| - |  TRUE CONFESSION (1937) ... Cazautógrafos | |
| - | WEST OF THE DIVIDE (1934) ... Spuds [como Billie O'Brien] | |
| - | GALLOPING KID, THE (1932) ... Buck Parker [como Little 'Buck' Dale] | |
| - | GOLDEN WEST, THE (1932) | |
| - | VIRGINIAN, THE (1929) ... Chico | |
