American* (*presumed) actor. This actor is listed by The Harold Lloyd Encyclopedia as being in the 5 Harold Lloyd films listed on this page.
As there were at least four Jack O'Briens working in films or entertainment at the same time, it is difficult to know which guy this was. We suspect this is NOT the Australian-born Jack O'Brien, because he didn't immigrate to the U.S.A. until mid-1920 - after these films were made.
So, that leaves us with:
-a silent film actor-director John B. O'Brien (1884-1936), who was sometimes known as Jack O'Brien.
-actor Jack O'Brien (b. John Jerome O'Brien, 1896-1942), sometimes known in the trades as "Big Jack" O'Brien (owing to his being over 6'3"), who was a "screen daredevil" and leading man in films and serials of the 1920s (notable credits include 1920's "The Stealers" which was Norma Shearer's first onscreen credit, being the leading man in 1922's "The Bride's Play" with Marion Davies, and playing "Dinny" in John Ford's famed 1924 Western "The Iron Horse").
-the noted boxer Philadelphia Jack O'Brien (1878-1942).
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