Cassiani entered Exxon Company USA in 1969 after earning a bachelor’s degree in geology and a master’s degree in geophysics from Boston College. His early assignments in geophysical interpretation were in the Southeastern exploration division in New Orleans. Cassiani developed through different exploration and production department assignments and was appointed as district exploration manager in the Southwestern division in Midland, TX, in 1975.
In 1977, Cassiani was appointed as geophysical manager for Exxon’s Gulf of Mexico and Atlantic operations. He turned up as an exploration planning manager in 1981, and assistant manager, corporate planning, in 1982.
In August 1984, Cassiani was appointed as manager of the Southeastern exploration division. He turned up as an operations manager of the exploration department of Exxon Company USA in August 1986 and vice president of the exploration department in August 1987. He was appointed as executive vice president with the formation of Exxon Exploration Company in 1992.
Greenlee stepped into Exxon Production Research Company in 1981 after earning a bachelor’s degree in geology from Duke University and a master’s degree in geological oceanography from the University of Rhode Island. He held numerous research and supervisory roles with Exxon Production Research Company in Houston and London before moving to Exxon Ventures Inc. in 1993 where he had supervisory responsibilities for Western Siberia and Kazakhstan.
In 1996, Greenlee became manager of geological operations for production operations at Exxon Company USA, based in New Orleans. He was named as manager of area geoscience for Brazil for ExxonMobil Exploration Company in 2000 and a year later turned up as a vice president, geoscience, for Saudi Arabia.
Greenlee became upstream advisor at Exxon Mobil headquarters in Irving, TX, in 2002 and was named as vice president for geoscience for Asia Pacific, ExxonMobil Exploration Company, in 2004.
