Executive Profile
Liam Mallon
BCG Executive Coach and Senior Advisor
Former President, ExxonMobil Upstream Company
Former Vice President, ExxonMobil Corporation
Offering advice to help people and leaders be the best they can be.
Liam is primarily interested in providing services in the non oil & gas energy sectors.
Former President
ExxonMobil Upstream Company
$20B+
Annual capital allocation managed
35 Years
Leading in globally complex businesses
About
Liam Mallon retired in February 2025 as President of ExxonMobil Upstream Company and Vice President of Exxon Mobil Corporation. He spent more than 40 years in the energy sector, living in eight different countries and working for four companies. His last 35 years were with Mobil and post-merger ExxonMobil, where he led the successful transformation of the Upstream business, including doubling its profitability and fundamentally restructuring the traditional organizational model.
As President of ExxonMobil Development Company, Liam managed a global portfolio of more than 100 projects designed to develop 20 billion barrels of oil equivalent. He oversaw $20 to $30 billion in annual capital spend and drove material growth through exploration success and acquisitions, highlighted by the extraordinary Guyana story and the addition of Pioneer Natural Resources to the portfolio. He played a key role in portfolio management strategy, mergers, acquisitions, and divestments. He had external relationship responsibility for key countries including Nigeria, PNG, Middle East, Mozambique, and the US, and interacted directly with heads of state and top national oil companies and ministries across the world.
Over the last several years, Liam was part of a small senior executive team charged with recasting the corporation's approach to leadership development and helping redefine the culture and values critical for success. He now serves as a BCG Executive Coach and Senior Advisor, working selectively with non-energy sector leaders and organizations, leveraging his deep experience in capital-intensive, operationally complex, and geopolitically sensitive environments.
Relevance
Where his experience is relevant today
Geopolitical and international complexity
Leaders navigating operations, partnerships, or investments across multiple countries and regulatory regimes — where understanding government relationships, stakeholder dynamics, and political risk is essential to success.
Growth strategy under complexity
Companies facing rapid expansion into new markets, geographies, or business models — where strategic clarity and operational discipline must advance together.
Major capital allocation decisions
Boards and leadership teams weighing large, consequential capital commitments where the analytical and judgment dimensions are equally demanding.
Business model transition
Organizations navigating a meaningful shift in how they create value — including moves from capital-light to capital-intensive operating models.
CEO and leadership team development
Senior leaders who want a thought partner with direct experience running complex global organizations — not a framework, but a conversation grounded in practice.
Board-level decision making
Boards seeking a director or advisor who has sat on both sides of the table and understands what good governance looks like when the decisions are genuinely difficult.
Those who have worked with Liam describe a rare combination: someone who has genuinely lived the decisions he discusses, who challenges thinking without losing the thread of the conversation, and whose counsel is structured enough to act on.
Background
Career
- President, ExxonMobil Upstream Company
- Vice President, Exxon Mobil Corporation
- President, ExxonMobil Development Company
- Leadership roles across Africa, Australia, Asia, and the Americas
- Joined ExxonMobil in 1990; retired February 2025
Education
- B.Sc., Mechanical Engineering — Trinity College Dublin
- M.Sc., Petroleum Engineering — Heriot-Watt University
Civic
- Board of Directors, United Way of Houston
- Former Chair, Spindletop Charities
- Executive Sponsor, ExxonMobil Black Employee Success Team
- Executive Sponsor, ExxonMobil Women's International Network
Liam and his wife, Gill, live in Houston and have three children and four grandchildren. They also spend time at homes in Galveston, Texas and Colorado. He is close to his family and finds the time with his grandchildren particularly meaningful.
Selective Opportunities
If there may be a fit
Liam is open to selective conversations about speaking, board, advisory, and executive coaching opportunities — where there is a genuine fit between the challenge and his background. If you are considering an introduction, the form below is the right place to start.
Important Notice
Liam is primarily interested in providing services in the non oil & gas energy sectors.