No O'Brien/O'Bryan/ found at https://imuseum.im/search//people/search?tab=people&view=&term=o%27...
There are a number of James O'Brien US naturalisation records but all born in Ireland.- see this doc fits date - https://media.geni.com/p14/90/00/ec/79/53444863a627e100/james_o_brien_1810_naturalisation_original.jpg?hash=d556a5dd505ebf6f9fccd7360c23c9d5c5cb82663ed4cbb8fe58bb1dd73d65f4.1745132399
Could it be that he was born in Ireland?
Found
Pennsylvania, U.S., Arriving Passenger and Crew Lists, 1798-1962
Name James O Brien
Gender Male
Arrival Age 25
Birth Date 1810
Departure Place Londonderry, Ireland
Arrival Date 25 Jul 1835
Arrival Place Philadelphia, Pennsylvania, USA
Ship Earl Kellie
The National Archives at Washington, D.C.; Washington, D.C.; Series Title: Passenger Lists of Vessels Arriving at Philadelphia, Pennsylvania; Record Group Title: Records of the United States Customs Service, 1745-1997; Record Group Number: 36; Series: M425; Roll: 50
Also - could he have gone as a child?
U.S. and Canada, Passenger and Immigration Lists Index, 1500s-1900s
U.S. and Canada, Passenger and Immigration Lists Index, 1500s-1900s
Name James O'Brian
Age 12
Birth Year abt 1815
Arrival Year 1827
Arrival Place New York, New York
Primary Immigrant O'Brian, James
Source Publication Code 503.10.91
Annotation Date and port of arrival. Gender, occupation, country of origin, name of ship, and final destination may also be provided. Extracted from Customs passenger lists which are among the holdings of the National Archives. When family relationships were unclear, editor arranged passengers and dependents in alphabetic sequence by given name.
Source Bibliography BENTLEY, ELIZABETH P. Passenger Arrivals at the Port of New York, 1820-1829. Baltimore: Genealogical Publishing Co., 1999, pp. 655-1373 (Ju-Z).