1855 369 Broadway, New York, New York.
Marcus A. O’Brien was recorded in one advertisement that appeared on August 15, 1855 in The New York Herald (New York, New York). Daguerreotypes, Photographs and Stereoscopes.—Marcus A. O’Brien, so long and favorably known as principal operator in one of the oldest galleries in the city, would respectfully inform his friends and the public that he has taken the first class establishment known as Gaige’s International Daguerrean Gallery, 369 Broadway, first door above Taylor’s saloon. Photographs, from cabinet to life size, taken less than at any other establishment in the city. Daguerreotypes, photographs and stereoscopes taken in all kinds of weather.
Marcus A. O’Brien is recorded in Craig’s Daguerreian Register as being active in New York city 1853-1859, but is listed without a business address in 1855.