Marathon Oil Announces Two Executive Appointments

Marathon Oil Announces Two Executive Appointments

HOUSTON, Nov. 1, 2012 (GLOBE NEWSWIRE) -- Marathon Oil Corporation (NYSE: MRO)
today announced that its Board of Directors has elected Sylvia J. Kerrigan as
executive vice president, general counsel and secretary, and Lance W.
Robertson as vice president, Eagle Ford Production Operations. Previously,
Kerrigan served as vice president, general counsel and secretary, and
Robertson as regional vice president, South Texas/Eagle Ford. Kerrigan will
continue reporting to Clarence P. Cazalot, Jr., chairman, president and CEO,
and Robertson will continue reporting to David E. Roberts, Jr., executive vice
president and chief operating officer. Both appointments were effective Oct.
31, and these individuals will continue to be based in Houston.

"Both Sylvia and Lance have consistently demonstrated the depth of their
knowledge and expertise in their respective disciplines, as well as their
significant leadership abilities in the execution of Marathon Oil's business
plans and strategies," said Cazalot. "They are to be commended for their past
performance and we look forward to the many contributions they will continue
to make to responsibly and profitably grow our Company in the years ahead."

Kerrigan joined Marathon Oil in 1995 and was named vice president and general
counsel in September 2009, and secretary in November 2009. Prior to that, she
served as assistant general counsel for Litigation, Human Resources and
Environmental Law.

In addition to her work at Marathon Oil, Kerrigan worked at the United Nations
Security Council's Commission d'Indemnisation in Geneva, Switzerland (UNCC)
for two years, and was in private practice for five years. At the UNCC, she
served as the senior legal officer and team leader responsible for arbitrating
the losses sustained by international energy companies following Iraq's 1990
invasion of Kuwait. In private practice, Kerrigan counseled energy,
construction, manufacturing and transportation clients on complex commercial,
international and insurance matters. During law school, she clerked for the
Texas Supreme Court.

Kerrigan holds a bachelor's degree in philosophy, political economy and
English from Southwestern University, and a doctor of jurisprudence degree
from the University of Texas. She is a past chairman of the State Bar of Texas
International Law Section and a Life Fellow of the Texas Bar Foundation. She
has served on the board of directors for various professional organizations,
including the American Leadership Forum, the Center for American and
International Law, the Houston Bar Association, and the University of Texas
Law Energy Center Advisory Board.

Robertson joined Marathon Oil in October of 2011 and since then has been
responsible for all of the Company's operations in the Eagle Ford shale play
of South Texas. In this role, his responsibilities include strategic and
tactical operational leadership throughout the entire region, working in
collaboration with Marathon Oil's exploration, engineering, land and
operations teams. He has direct oversight and responsibility for the
successful execution of all drilling, completion and production activities
while leading the development of best practices and continuous improvement to
maximize the value of Marathon Oil's substantial investments in the Eagle Ford
play.

Robertson earned a bachelor's degree in petroleum engineering from Texas A&M
University and an MBA from Southern Methodist University. Prior to joining
Marathon Oil, Robertson served as vice president of Operations - Eagle Ford
Asset Team for Pioneer Natural Resources.

Between 2004 and 2011, he held a number of senior engineering and operations
management roles of increasing responsibility with Pioneer Natural Resources
in the U.S. and Canada. Robertson began his career with ExxonMobil as a
drilling engineer in Angola and Equatorial Guinea.

Marathon Oil Corporation is an independent international energy company. Based
in Houston, Texas, Marathon Oil had net proved reserves at the end of 2011 of
1.8 billion barrels of oil equivalent in North America, Europe and Africa.

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