With the expected nomination of ExxonMobil CEO Rex Tillerson to the position of U.S. Secretary of State, the recent book Private Empire: ExxonMobil and American Power by Columbia University dean of journalism Steve Coll seems newly relevant—so much so that, following Friday’s news about the nomination, Amazon has been temporarily sold out.

Coll has also just published a new piece over at The New Yorker looking at Tillerson’s legacy with the global oil firm. There, Coll describes ExxonMobil as resembling “an independent, transnational corporate sovereign in the world, a power independent of the American government, one devoted firmly to shareholder interests and possessed of its own foreign policy.”

Exxon’s foreign policy sometimes had more impact on the countries where it operated than did the State Department. Take, for example, Chad, one of the poorest countries in Africa. During the mid-two-thousands, the entirety of U.S. aid and military spending in the country directed through the U.S. Embassy in the capital, N’Djamena, amounted to less than twenty million dollars annually, whereas the royalty payments Exxon made to the government as part of an oil-production agreement were north of five hundred million dollars. Idriss Déby, the authoritarian President of Chad, did not need a calculator to understand that Rex Tillerson was more important to his future than the U.S. Secretary of State.

Should Tillerson be confirmed, Coll suggests, his new role “will certainly confirm the assumption of many people around the world that American power is best understood as a raw, neocolonial exercise in securing resources.”

The Guardian agrees, suggesting that, “In a very real sense, Tillerson has been a head of a state within a state. Exxon Mobil is bigger economically than many countries. It has its own foreign policy and its own contracted security forces.”

Consider picking up a copy of Private Empire and read more from Coll over at The New Yorker.