Marathon Oil Corporation Chairman, President And CEO, Clarence P. Cazalot, Jr., To Retire Dec. 31, 2013 - Lee M. Tillman Elected President And CEO Effective Aug. 1, 2013

HOUSTON, June 13, 2013 (GLOBE NEWSWIRE) -- Clarence P. Cazalot, Jr, chairman, president and CEO of MarathonOil Corporation (NYSE: MRO) has elected to retire on Dec. 31, 2013,after almost 14 years leading Marathon Oil and 41 years in the oiland gas industry. Cazalot will continue as executive chairmanthrough Dec. 31, 2013. The Marathon Oil board of directors haselected Lee M. Tillman to the board of directors and to succeedCazalot as president and CEO effective Aug. 1, 2013. The board ofdirectors intends to nominate Dennis H. Reilley, currently MarathonOil lead director, as non-executive chairman upon Cazalot'sretirement.

Tillman, 51, most recently served as vice president ofEngineering for ExxonMobil Development Company where he wasresponsible for all global engineering staff engaged in majorproject concept selection, front end design and engineering. Heholds a Bachelor of Science degree in chemical engineering withhonors from Texas A&M University and a Ph.D. in chemicalengineering from Auburn University. Following his formal education,Tillman began his career in the oil and gas industry at Exxon in1989 as a research engineer. He has extensive operations managementand leadership experience that has included assignments in Jakarta,Indonesia; Aberdeen, Scotland; Stavanger, Norway; Malabo,Equatorial Guinea; Dallas and New Orleans.

"Speaking for the entire Marathon Oil board of directors, we arevery pleased to welcome Lee to the Company. His strongleadership skills and extensive experience in global operations,project execution and leading edge technology will be invaluable inconfronting the challenges facing our Company and industry," saidCazalot. "I look forward to working with Lee, the rest of ourexecutive leadership team, and all our dedicated employees over thenext six months as we transition to his leadership and continue toexecute on our well defined strategy."

"Marathon Oil's strong set of base and growth assets, along witha robust exploration portfolio, reputation in the industry as avalued partner and dedication to exemplary corporate values makethis a position I am very proud and excited to accept," saidTillman. "The progress Marathon Oil has made moving from anintegrated company to an independent exploration and productioncompany over the past two years has been nothing short ofexceptional. The combined efforts of a dynamic board, focusedmanagement and dedicated global employees have yielded MarathonOil's differentiating performance and strong growth outlook. Ilook forward to building on this solid foundation to furtherenhance Marathon Oil's long term shareholder value."

Marathon Oil Corporation is an international exploration andproduction company. Based in Houston, Texas, the Company had netproved reserves at the end of 2012 of 2 billion barrels of oilequivalent in North America, Europe and Africa. For moreinformation, please visit the Company's website at http://www.marathonoil.com.

Note to Editors:

Lee Tillman's bio is included below.  Bios for ClarenceCazalot and Dennis Reilley are available online at http://www.marathonoil.com/About_Us/Board_of_Directors/. Photos are available upon request.

Lee M. Tillman

Lee M. Tillman is joining Marathon Oil Corporation Aug. 1, 2013,as president and CEO. Since 2010, he has been vice president ofEngineering for ExxonMobil Development Company where he wasresponsible for all global engineering staff engaged in majorproject concept selection, front end design and engineering. Heholds a Bachelor of Science degree in chemical engineering withhonors from Texas A&M University and a Ph.D. in chemicalengineering from Auburn University.

Following his formal education, Tillman began his career in theoil and gas industry at Exxon in 1989 as a research engineer.

Tillman progressed through positions of increasingresponsibility in Houston; New Orleans; Jakarta, Indonesia; andAberdeen, Scotland. He assumed the position of operationssuperintendant, New Orleans Production Organization in 1998, andwas named operations manager, Mobil Equatorial Guinea relocating toMalabo, Equatorial Guinea in 2001.

In 2003, Tillman moved to Irving, Texas as upstream advisor tothe ExxonMobil management committee. Relocating to Houston in 2005,he was appointed offshore division manager, ExxonMobil UpstreamResearch Company. From 2006 to 2007, he served as acting vicepresident, ExxonMobil Upstream Research Company.

From 2007 to 2010, Tillman served as North Sea productionmanager and lead country manager in Stavanger, Norway.

Tillman is a member of the Society of Petroleum Engineers.
CONTACT: Media Relations Contacts:		         Lee Warren	713-296-4103         John Porretto	713-296-4102                  Investor Relations Contacts:         Howard Thill	713-296-4140         Chris Phillips	713-296-3213

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