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Douglas Manner
Director/Board Member at
SINTANA ENERGY INC.
Net worth: 2 M $ as of 2026-05-30
Profile
Douglas Glenn Manner is currently a Non-Executive Director at S E Land Plc since 2007 and at Sintana Energy, Inc. starting in 2025.
Memberships include the Society of Petroleum Engineers, Inc. and the Association of Professional Engineers & Geoscientists of AB. Former roles include Chairman & Chief Executive Officer at Mission Resources Corp.
(2001-2002), Chief Executive Officer & Director at Westside Energy Corp.
(2005-2008), President, Chief Executive Officer & Director at Sintana Holdings Corp.
(2012), Chief Executive Officer at Bellwether Resources International, Inc., Chairman at Central Energy Partners LP (2004-2010), Chairman at Bellwether Exploration Co. (2000-2001), Chairman & Manager at Central Energy GP LLC (2010), Director at Penn Octane Corp.
(2008-2010), Director at Cordero Energy, Inc. (2005-2008), Independent Non-Executive Director at Cona Resources Ltd. (2014-2017), Chief Operating Officer & Vice President at Gulf Canada Resources Ltd. (1998-2000), Chief Operating Officer & Senior Vice President at Kosmos Energy LLC (2004-2015), President & Chief Operating Officer at White Stone Energy LLC (2002-2003), Partner at Northbrook Energy LLC (2008-2011), and other directorships and executive roles at various energy companies.
Education includes an undergraduate degree from William Marsh Rice University, conferred in 1977.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
SINTANA ENERGY INC. 1.01% | 2026-02-12 | 5,195,558 ( 1.01% ) | 2 M $ | 2026-05-30 |
Douglas Manner active positions
| Companies | Position | Start |
|---|---|---|
| IRVINE ENERGY PLC | Director/Board Member | 2009-09-08 |
| SINTANA ENERGY INC. | Director/Board Member | 2025-12-15 |
Association of Professional Engineers & Geoscientists of AB
 Association of Professional Engineers & Geoscientists of AB Miscellaneous Commercial ServicesCommercial Services Operates an association for practices of engineering and geoscience | Corporate Officer/Principal | - |
Society of Petroleum Engineers, Inc.
 Society of Petroleum Engineers, Inc. Engineering & ConstructionIndustrial Services Provides petroleum engineering services | Corporate Officer/Principal | - |
Former positions of Douglas Manner
| Companies | Position | End |
|---|---|---|
| CONA RESOURCES LTD | Director/Board Member | 2017-06-21 |
Northbrook Energy LLC
 Northbrook Energy LLC Electric UtilitiesUtilities Develops, owns and operates hydroelectric assets | Corporate Officer/Principal | 2011-03-31 |
| PENN OCTANE CORPORATION | Director/Board Member | 2010-12-01 |
| CENTRAL ENERGY PARTNERS LP | Chairman | 2010-11-16 |
Cordero Energy, Inc.
 Cordero Energy, Inc. Contract DrillingIndustrial Services Explores oil and natural gas | Director/Board Member | 2008-09-04 |
Training of Douglas Manner
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
64
1st degree connections
31
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 31 |
|---|---|
Mission Resources Corp.
 Mission Resources Corp. Oil & Gas ProductionEnergy Minerals Explores, develops and operates oil and natural gas properties | Energy Minerals |
Penn Octane Corp.
 Penn Octane Corp. Gas DistributorsUtilities Distributes, transports and markets liquefied petroleum gas | Utilities |
Gulf Canada Resources Ltd.
 Gulf Canada Resources Ltd. Oil & Gas ProductionEnergy Minerals Explores for, produces, and develops oil and gas properties | Energy Minerals |
Resolute Energy, Inc.
 Resolute Energy, Inc. Oil & Gas ProductionEnergy Minerals Explores for and produces gas and oil | Energy Minerals |
Westside Energy Corp.
 Westside Energy Corp. Oil & Gas ProductionEnergy Minerals Explores and develops oil and gas properties | Energy Minerals |
Central Energy Partners LP
 Central Energy Partners LP Wholesale DistributorsDistribution Services Provides liquid bulk storage, trans-loading and transportation services for hazardous chemicals and petroleum products | Distribution Services |
Blizzard Energy, Inc.
 Blizzard Energy, Inc. Oil & Gas ProductionEnergy Minerals Produce oil and natural gas | Energy Minerals |
Cordero Energy, Inc.
Cordero Energy, Inc. Contract DrillingIndustrial Services Explores oil and natural gas | Industrial Services |
Zenas Energy Corp.
 Zenas Energy Corp. Oil & Gas ProductionEnergy Minerals Explores, produce, and develops oil and gas properties | Energy Minerals |
Sintana Holdings Corp.
 Sintana Holdings Corp. Contract DrillingIndustrial Services Engaged in petroleum and natural gas exploration and development | Industrial Services |
Rice University
 Rice University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Gulf Midstream Services
 Gulf Midstream Services Oil & Gas ProductionEnergy Minerals Produces natural gas | Energy Minerals |
Bellwether Exploration Co.
 Bellwether Exploration Co. Oil & Gas ProductionEnergy Minerals Provides oil and gas exploration services | Energy Minerals |
CNR Petro Resources Ltd.
 CNR Petro Resources Ltd. Contract DrillingIndustrial Services Explores for and develops heavy oil resources | Industrial Services |
Kosmos Energy LLC
 Kosmos Energy LLC Contract DrillingIndustrial Services Provides oil and gas exploration services | Industrial Services |
S E Land Plc
 S E Land Plc Real Estate DevelopmentFinance Invests in real estate | Finance |
Ryder Scott Co. LP
 Ryder Scott Co. LP Miscellaneous Commercial ServicesCommercial Services Provides reservoir-evaluation consulting services | Commercial Services |
Society of Petroleum Engineers, Inc.
Society of Petroleum Engineers, Inc. Engineering & ConstructionIndustrial Services Provides petroleum engineering services | Industrial Services |
Central Energy GP LLC
 Central Energy GP LLC Oil & Gas ProductionEnergy Minerals Distributes, transports, and markets liquefied petroleum gas | Energy Minerals |
Association of Professional Engineers & Geoscientists of AB
Association of Professional Engineers & Geoscientists of AB Miscellaneous Commercial ServicesCommercial Services Operates an association for practices of engineering and geoscience | Commercial Services |
Petroleum Society of CIM | |
White Stone Energy LLC | |
Crusader Energy Group, Inc. /Old/
 Crusader Energy Group, Inc. /Old/ Oil & Gas ProductionEnergy Minerals Explores for oil and gas | Energy Minerals |
Crusader Energy Group, Inc.
 Crusader Energy Group, Inc. Oil & Gas ProductionEnergy Minerals Engages in acquisition, exploration, development, production and sale of oil & natural gas liquids | Energy Minerals |
Northbrook Energy LLC
Northbrook Energy LLC Electric UtilitiesUtilities Develops, owns and operates hydroelectric assets | Utilities |
Santa Maria Petroleum, Inc.
 Santa Maria Petroleum, Inc. Oil & Gas ProductionEnergy Minerals Engages in acquisition, exploration and development of petroleum interests | Energy Minerals |
Cona Resources Ltd.
 Cona Resources Ltd. Integrated OilEnergy Minerals Engages in the exploration, acquisition, development, and production of petroleum and natural gas reserves | Energy Minerals |
Mobius Resources, Inc.
 Mobius Resources, Inc. Oil & Gas ProductionEnergy Minerals Explores oil and natural gas properties | Energy Minerals |
Sintana Energy, Inc.
 Sintana Energy, Inc. Oil & Gas ProductionEnergy Minerals Operates as crude oil and natural gas exploration and development company | Energy Minerals |
Bellwether Resources International, Inc.
 Bellwether Resources International, Inc. Oilfield Services/EquipmentIndustrial Services Manufactures and distributes drilling accessories | Industrial Services |
Petrovera Energy Co. |
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