Cullinan was born to John Francis and Mary (nee Considine) Cullinan on December 31, 1860, in Pulaski Township, Lawrence County, Pennsylvania, not far from
Sharon, Pennsylvania. His first experience in the
oil industry was when he was 14, working as a hand in the
Pennsylvania oilfields. He was responsible for various oil-related duties including a distribution station in Oleopolis, Pennsylvania. This broad exposure prepared him well for his future ventures in the industry. When he was 22, he joined an affiliate of
Standard Oil and for the next thirteen years, performed various managerial duties. Cullinan started with a small drilling operation along the Gulf Coast of Texas and had expanded over the years, moving west toward Houston and later pushed east toward New Orleans. ==Career==