Daniel O'Day

Daniel O'Day Jr. (March 11, 1870 – May 31, 1916) was one of northwestern Pennsylvania's earliest independent refiners to be brought into John D. Rockefeller's Standard Oil Company.

His father, Daniel O'Day, was a director of the Standard Oil Company and a prominent factor in the petroleum business for forty years.

Daniel O'Day Sr. was the close personal friend of John D. Rockefeller; he was said to be the master mind on the transportation end of the Standard's scheme for monopolizing the oil business of the country at a time when the opposition of the independent petroleum companies was at its height.

O'Day would eventually manage crews that laid pipe to bring oil from wells to the railroads.

Despite attempts by many Standard Oil critics/enemies to sabotage the pipelines, O'Day's crews were skilled and efficient enough to lay pipe faster than it could be destroyed.