Learn more about XTO Energy’s management team.


In this article


Bart Cahir

A native of Pennsylvania, Bart Cahir earned a bachelor’s degree in petroleum and natural gas engineering from Penn State University. 

Bart joined ExxonMobil as a subsurface engineer in 1994 and progressed through various assignments focused on upstream oil and gas operations in the United States.  In 2004, he moved to ExxonMobil’s Production headquarters as a planning and business analyst for the Asia-Pacific and Middle East regions. 

Bart relocated to Indonesia in 2006 where he was appointed technical manager and later, operations manager for ExxonMobil Oil Indonesia Inc.  During this time, he also served as a director for PT Arun LNG. In these roles, he was responsible for the oversight of ExxonMobil’s gas production and LNG manufacturing assets in North Aceh, Indonesia. 

In 2010, Bart moved to Qatar to become joint interest manager, as well as general manager, for the Al Khaleej gas project. In 2012, he was appointed production and lead country manager for ExxonMobil Qatar Inc. where he was responsible for leading the interface for all ExxonMobil activities in Qatar and abroad, in partnership with Qatar Petroleum. 

In 2015, Bart was appointed senior vice president, Upstream, Imperial Oil Limited and president, Imperial Oil Resources. During this time, he also was affiliated with the Canadian Association of Petroleum Producers, serving as a member of the Board of Governors and Oil Sands CEO Council, as well as chairman of the Oil Sands EPG.  

In 2017, Bart was appointed executive advisor to the chairman of Exxon Mobil Corporation, then in 2019, became senior vice president, ExxonMobil Global Projects Company. 

In his current role as president of XTO Energy, Bart oversees unconventional oil and natural gas production for ExxonMobil’s assets across the United States, Canada and Argentina. 

Bart and his wife, Andrea, have two children.  He is based in Houston.

Andrée Griffin

A native of Fort Worth, Texas, Andrée earned a bachelor’s degree in geology from Duke University and a master’s degree in geology from Texas Christian University (TCU).

She joined XTO in 2004 as a division geologist and was promoted to geology manager for the company’s Barnett Shale operations in 2005. In 2010, Andrée became geology manager for XTO’s operations in the Appalachia region, and in 2013, became vice president of geology and geophysics.

In her current role as vice president of unconventional development, Andrée oversees acquisitions and divestitures, reserves and data analytics, geology, land and reservoir management with respect to XTO’s unconventional portfolio across the United States, Canada and Argentina.

Prior to joining XTO, Andrée held positions with small independent oil companies. She was vice president of geology at Wagner Oil Company and an exploration geologist at Burnett Oil Company. She also worked as an exploration geologist at Union Pacific Resources and Sun Company, where she began her career.

Andrée served as the chairman of the Board of Directors for the Fort Worth Wildcatters in 2016, and currently serves on the board of the TCU Energy Institute. She also serves on the Innovation Committee for the Fort Worth Museum of Science and History. She is a member of the Association of Petroleum Geologists and Fort Worth Geological Society.

Andrée is married and has three adult children.

Carman Mullins

A native of Yazoo City, Mississippi, Carman graduated from Mississippi State University with a Bachelor of Science degree in mechanical engineering. She began her career in 1996 as a facilities engineer with Exxon, based in New Orleans. Over the next 11 years, she held progressively senior technical, supervisory and planning roles in various assignments in the United States. In 2009, she was appointed safety and operations integrity manager for ExxonMobil Production.

In 2010, Carman relocated to Canada, where she served as surface engineering technical manager, followed by Horn River project manager, for Imperial Oil Resources. In 2013, she moved to Malaysia to assume duties with ExxonMobil Exploration and Production Malaysia Inc., first as general manager of surface technical, followed by senior general manager.

Carman returned to Canada in 2017 as president of ExxonMobil Canada Ltd. (EMC), responsible for the corporation’s upstream interests in Canada, as well as EMC’s interest in exploration and production activities in Western Canada and exploration licenses offshore Newfoundland and Labrador. While there, she served as board chair of Petroleum Research Newfoundland and Labrador and actively participated in the Canadian Association of Petroleum Producers’ Offshore Policy Group.

In her current role as vice president of XTO’s Permian business unit, Carman is responsible for the company’s Permian Basin assets, leading the effort to grow daily production to 1 million oil-equivalent barrels by 2024 and maximize opportunities across the full value chain.

Carman and her husband, Jason, have two children.

Glenn Scott

A native of Austin, Texas, Glenn graduated from Texas A&M University in 1986 with a Bachelor of Science degree in petroleum engineering.

Glenn joined Mobil Oil Corporation in 1986 as an operations/completions engineer and progressively held more responsible positions in the company. In 1994, he became liquefied natural gas (LNG) marketing manager in Doha, Qatar.

Following the Exxon and Mobil merger, Glenn became ExxonMobil's UK joint venture manager in London, England, in 2001. The following year he was appointed U.S. equity crude sales manager in Fairfax, Virginia.

Glenn became operations manager with the ExxonMobil Production Company in 2004, based in Houston, responsible for approximately one-third of ExxonMobil’s operated production in the United States.

In 2006, Glenn was appointed president of ExxonMobil Canada Limited and production manager for ExxonMobil Canada East, responsible for ExxonMobil's East Coast Canadian offshore business. He served as senior vice president, upstream, Imperial Oil Limited before being appointed as president of Imperial Oil Resources in 2010.

Glenn joined XTO in 2015 as senior vice president of the advisory & support team and international ventures. In 2018, he was appointed senior vice president of operations and international ventures. In his current role as vice president of unconventional business units, Glenn is focused on operations efficiency and maximizing value across XTO’s domestic and international portfolio, excluding the Permian Basin.

Glenn and his wife, Ellen, have three children attending college.

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