John O'Brien is an artist. 1 work is cataloged here, principally at National Gallery of Canada.

John O’Brien painted quiet scenes of 19th-century Halifax harbor in oils. In “The Frank off George’s Island, Halifax” (1856) you’ll see a single schooner gliding past a small island fort under pale winter light, no crowds, no drama, just the calm daily work of sails and water. His brush keeps the scene cool and matter-of-fact, like a snapshot. Slide over to the harbor itself to feel the same still air.