Teagle rose threw the ranks of Standard Oil after joining in 1901, making a name for himself through his managing of the company’s international operations after the anti-trust breakup in the early 1910s. Throughout his term as president of Standard Oil, Teagle continued his success in the international arena, acquiring operations in Iran and Venezuela. He was also instrumental in expanding the company’s presence in the petrochemistry field. All of these endeavors led Standard Oil’s market share to grow from 2% to 11.5%, making it the world’s largest oil producer.