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.
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.