Mark McCollum – Biography
Last update: April 8, 2026Executive profile
Mark was President and Chief Executive Officer at Weatherford International, and Executive Vice President and Chief Financial Officer at Halliburton. Mark McCollum joined Westlake in 2026.
Mark McCollum is currentlyDirector and Chair of the Audit Committee at Momentive - View - Momentive org chart
Director at Westlake - View - Westlake org chart
Independent Director and Chair of Audit Committee at Seadrill - View - Seadrill org chart
Independent Director at Oneok - View - Oneok org chart
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Education
In 1980, Mark McCollum completed a Bachelor of Business Administraton at Baylor University.
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Company Colleagues
- At Momentive, Mark McCollum has 58 colleagues including Craig Borkowski (CEO), David Fischer (Director)…
- At Westlake, Mark McCollum has 59 colleagues including Jean-Marc Gilson (CEO & Director), Jeff Sheets (Director)…
- At Seadrill, Mark McCollum has 124 colleagues including Samir Ali (CEO), Ana Zambelli (Director)…
- At Oneok, Mark McCollum has 83 colleagues including Pierce Norton (President, CEO & Director), Brian Derksen (Director)…
Industry Colleagues
- In the Chemicals industry, Mark McCollum has 17,228 colleagues in 908 companies located in 66 countries. 9,981 executive movements have been recorded in the last 12 months. Learn more about Chemicals.
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