 After Exxon and Mobil merged in 1999, Pryor became president of the ExxonMobil Lubricants & Specialties Company and a vice president of Exxon Mobil Corporation.In 2002 he became executive vice president of ExxonMobil Chemical Company and in 2004, president of ExxonMobil Refining & Supply Company.He was vice-president of Exxon Mobil Corporation from December 1, 2004 to January 1, 2015, and served as president of ExxonMobil Chemical Company (a subsidiary of Exxon Mobile Corporation) from April 1, 2008 to January 1, 2015.