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Mr. Mark A. McCollum

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He has been president and CEO of Weatherford International PLC since 2017. Previously, he was EVP and CFO of Halliburton Co. from 2008 until 2016. He held a number of senior positions at Tenneco Inc., including CFO, and was an audit and advisory partner in Arthur Andersen's Energy Division, where he began his career. He currently serves on the board of Archrock Inc and is a regent at Baylor University.

  • 2018 Third Quarter

Added to: Westlake Chemical Corp. - Houston, TX

Westlake is engaged in petrochemicals and fabricated products operations. Revenues are $9 billion.