![Mark McCollum](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Fortuna: 1 M $ al 30/06/2026
Mark A. McCollum is currently Independent Director at Westlake Corp.
since 2018, Director at Marathon Oil Co. LLC, Independent Director at ONEOK, Inc. starting 2026, Director at Baylor St. Luke's Medical Center, Independent Director at Seadrill Ltd. since 2022, Director at Momentive Performance Materials, Inc., Member of The American Institute of Certified Public Accountants, Member-Regents Board at Baylor University, Chief Financial Officer & Executive Vice President at Halliburton Group Canada, Inc., Member of Financial Executives International, Trustee at Baylor College of Medicine, President at Petris Technology, Inc., Member of Texas Society of Certified Public Accountants, Member of Institute of Management Accountants, Inc., Trustee at The Center Foundation, Trustee at Yellowstone Academy, and Partner at Mccollum Capital LLC.
Former roles include President, Chief Executive Officer & Director at Weatherford International plc from 2017 to 2020; Chairman at Star of Hope Mission; Director at Butler Manufacturing Co., Universal Compression Partners LP, Seadrill Ltd., and Archrock Partners LP; Director at Exterran GP LLC in 2009; Independent Director at Archrock, Inc. from 2002 to 2018; Director at KBR, Inc. from 2006 to 2007; Independent Director at Marathon Oil Corp.
from 2022 to 2024; Chief Financial & Integration Officer, EVP at Halliburton Co. from 2016 to 2017; Chief Financial Officer & Senior Vice President at Tenneco, Inc. from 1995 to 2003; Audit Partner-Energy Division at Arthur Andersen LLP from 1991 to 1995; and Chief Accounting Officer & Senior Vice President at Halliburton Energy Services, Inc. from 2003 to 2009.
Education includes an undergraduate degree from Baylor University conferred in 1980.
| Empresa | Fecha | Número de acciones | Valoración | Fecha de valoración |
|---|---|---|---|---|
WESTLAKE CORPORATION 0,01 % | 16/03/2026 | 9.656 ( 0,01 % ) | 704 888 $ | 30/06/2026 |
SEADRILL LIMITED 0,01 % | 03/06/2026 | 7.269 ( 0,01 % ) | 274 914 $ | 30/06/2026 |
ONEOK, INC. 0 % | 20/05/2026 | 2.572 ( 0 % ) | 223 610 $ | 30/06/2026 |
| Empresas | Cargo | Inicio |
|---|---|---|
| WESTLAKE CORPORATION | Director/Miembro de la Junta | 24/05/2018 |
| SEADRILL LIMITED | Director/Miembro de la Junta | 22/02/2022 |
| ONEOK, INC. | Director/Miembro de la Junta | 23/01/2026 |
Marathon Oil Co. LLC
 Marathon Oil Co. LLC Integrated OilEnergy Minerals Explores and transports, markets crude oil & natural gas | Director/Miembro de la Junta | - |
Mccollum Capital LLC | Corporate Officer/Principal | - |
Baylor St. Luke's Medical Center
 Baylor St. Luke's Medical Center Miscellaneous Commercial ServicesCommercial Services Operates as non-profit healthcare center | Director/Miembro de la Junta | - |
Yellowstone Academy
 Yellowstone Academy Other Consumer ServicesConsumer Services The private company is based in Houston, TX. It is paired with Yellowstone College Prep, a tuition-free public charter upper school for grades 6-12. Together, they educate over 600 primarily Black students from underserved communities, focusing on a Christian moral foundation, small class sizes, and comprehensive support including transportation and meals. The upper school is an early college high school offering up to 60 dual-enrollment college credits, preparing students for college and career success. While legally and financially separate, both schools share unified leadership, mission, and equal opportunity policies. Yellowstone Academy, part of Yellowstone Schools founded in 2001 in Houston’s historic Third Ward, operates as a private Christian lower school serving pre-K through 5th grade. | Director/Miembro de la Junta | - |
Petris Technology, Inc.
 Petris Technology, Inc. Packaged SoftwareTechnology Services Develops and markets integrated data management analytics and business intelligence software for oil and gas companies | Presidente | - |
Baylor University
 Baylor University Other Consumer ServicesConsumer Services Functions as a College/University | Director/Miembro de la Junta | - |
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Activas
Inactivas
Empresas cotizadas
Empresas privadas
Relaciones de 1er grado
Empresas vinculadas al 1er grado
Hombre
Mujer
Administradores
Ejecutivos
| Empresas privadas | 31 |
|---|---|
Butler Manufacturing Co.
 Butler Manufacturing Co. Building ProductsProducer Manufacturing Produces and markets building systems and components for nonresidential structures | Producer Manufacturing |
Halliburton Co.
 Halliburton Co. Oilfield Services/EquipmentIndustrial Services Provides products and services to the energy industry for exploring, developing & producing oil and natural gas | Industrial Services |
ONEOK, Inc.
 ONEOK, Inc. Oil & Gas PipelinesIndustrial Services Engages in gathering, processing, sale, transportation and storage of natural gas | Industrial Services |
Marathon Oil Corp.
 Marathon Oil Corp. Integrated OilEnergy Minerals Explores and produces crude oil & natural gas | Energy Minerals |
Tenneco, Inc.
 Tenneco, Inc. Auto Parts: OEMProducer Manufacturing Manufactures and sells automotive emission control, ride control products and systems | Producer Manufacturing |
Westlake Corp.
 Westlake Corp. Chemicals: SpecialtyProcess Industries Manufactures and supplies essential materials and housing & infrastructure products | Process Industries |
Universal Compression Partners LP
 Universal Compression Partners LP Gas DistributorsUtilities Provides natural gas compression services | Utilities |
Exterran GP LLC
 Exterran GP LLC MiscellaneousMiscellaneous Operates as a non-classified establishment | Miscellaneous |
Archrock, Inc.
 Archrock, Inc. Oilfield Services/EquipmentIndustrial Services Manufactures equipment for oil and natural gas production, processing and transportation | Industrial Services |
Marathon Oil Co. LLC
Marathon Oil Co. LLC Integrated OilEnergy Minerals Explores and transports, markets crude oil & natural gas | Energy Minerals |
Halliburton Energy Services, Inc.
 Halliburton Energy Services, Inc. Electric UtilitiesUtilities Provides energy services | Utilities |
KBR, Inc.
 KBR, Inc. Information Technology ServicesTechnology Services Provides technology, engineering and logistics support solutions to governments & companies | Technology Services |
Arthur Andersen LLP
 Arthur Andersen LLP Miscellaneous Commercial ServicesCommercial Services Provides accounting services | Commercial Services |
The American Institute of Certified Public Accountants
 The American Institute of Certified Public Accountants Miscellaneous Commercial ServicesCommercial Services Association of accountants | Commercial Services |
Baylor University
Baylor University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Halliburton Group Canada, Inc.
 Halliburton Group Canada, Inc. Oil & Gas ProductionEnergy Minerals Provides products and services to the oil and gas industry | Energy Minerals |
Financial Executives International
 Financial Executives International Miscellaneous Commercial ServicesCommercial Services Operates as a association for treasurers, controllers, tax executives and financial services | Commercial Services |
Baylor College of Medicine
 Baylor College of Medicine Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Seadrill Ltd. /Old/
 Seadrill Ltd. /Old/ Contract DrillingIndustrial Services Provides offshore deep water drilling services | Industrial Services |
Petris Technology, Inc.
Petris Technology, Inc. Packaged SoftwareTechnology Services Develops and markets integrated data management analytics and business intelligence software for oil and gas companies | Technology Services |
Momentive Performance Materials, Inc.
 Momentive Performance Materials, Inc. Chemicals: SpecialtyProcess Industries Develops and manufactures silicones and solutions | Process Industries |
Texas Society of Certified Public Accountants
 Texas Society of Certified Public Accountants Texas Society of Certified Public Accountants is based in Dallas, TX and has subsidiaries in the United States. The Texas Society of Certified Public Accountants (TXCPA) is an organization that aims to increase the number of individuals becoming licensed CPAs by expanding their outreach. The company offers opportunities for exhibitors and sponsors to participate in their CPE conferences. | |
Institute of Management Accountants, Inc.
 Institute of Management Accountants, Inc. Miscellaneous Commercial ServicesCommercial Services Operates as a association of accountants and financial professionals | Commercial Services |
Archrock Partners LP
 Archrock Partners LP Oilfield Services/EquipmentIndustrial Services Provides natural gas compression services | Industrial Services |
Star of Hope Mission
 Star of Hope Mission Services to the Health IndustryHealth Services Operates as a christ-centered community supporting homelessness men's, women's and children's | Health Services |
The Center Foundation | |
Yellowstone Academy
Yellowstone Academy Other Consumer ServicesConsumer Services The private company is based in Houston, TX. It is paired with Yellowstone College Prep, a tuition-free public charter upper school for grades 6-12. Together, they educate over 600 primarily Black students from underserved communities, focusing on a Christian moral foundation, small class sizes, and comprehensive support including transportation and meals. The upper school is an early college high school offering up to 60 dual-enrollment college credits, preparing students for college and career success. While legally and financially separate, both schools share unified leadership, mission, and equal opportunity policies. Yellowstone Academy, part of Yellowstone Schools founded in 2001 in Houston’s historic Third Ward, operates as a private Christian lower school serving pre-K through 5th grade. | Consumer Services |
Weatherford International plc
 Weatherford International plc Oilfield Services/EquipmentIndustrial Services Provides well construction technologies, production and drilling services | Industrial Services |
Baylor St. Luke's Medical Center
Baylor St. Luke's Medical Center Miscellaneous Commercial ServicesCommercial Services Operates as non-profit healthcare center | Commercial Services |
Seadrill Ltd.
 Seadrill Ltd. Contract DrillingIndustrial Services Provides offshore drilling services | Industrial Services |
Mccollum Capital LLC |
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