![William Klesse](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>)
William Klesse
Director/Board Member at
OCCIDENTAL PETROLEUM CORPORATION
Net worth: 13 M $ as of 2026-05-30
Profile
William R. Klesse is a businessperson who has been at the helm of 6 different companies and holds the position of President, Chief Executive Officer & Director at Valero Services, Inc. and President & Chief Executive Officer at Valero Renewable Fuels Co. LLC. Mr. Klesse is also on the board of 7 other companies. He previously occupied the position of Chairman & Chief Executive Officer of Valero Energy Corp. Chairman at Valero Energy Partners LP, Chairman for Valero Energy Partners GP LLC and Executive Vice President-Refining Operations at Ultramar Diamond Shamrock Corp. (which are all subsidiaries of Valero Energy Corp.) and Chairman for NuStar Energy LP. He received an undergraduate degree from the University of Dayton and an MBA from West Texas A&M University.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-05-03 | 222,149 ( 0.02% ) | 13 M $ | 2026-05-30 |
William Klesse active positions
| Companies | Position | Start |
|---|---|---|
| OCCIDENTAL PETROLEUM CORPORATION | Director/Board Member | 2013-10-10 |
The Briscoe Western Art Museum | Director/Board Member | - |
University of Dayton
 University of Dayton Other Consumer ServicesConsumer Services Functions as a College/University | Director/Board Member | - |
Valero Renewable Fuels Co. LLC
 Valero Renewable Fuels Co. LLC Chemicals: SpecialtyProcess Industries Owns and operates ethanol plants | Chief Executive Officer | - |
Texas Biomedical Research Institute
 Texas Biomedical Research Institute Miscellaneous Commercial ServicesCommercial Services Operates as a non-profit biomedical research institution | Director/Board Member | - |
United Way of San Antonio & Bexar County
 United Way of San Antonio & Bexar County Miscellaneous Commercial ServicesCommercial Services Provides health and human care services | Director/Board Member | - |
Christus Santa Rosa Children’s Hospital Foundation | Director/Board Member | - |
Former positions of William Klesse
| Companies | Position | End |
|---|---|---|
| MEG ENERGY CORP. | Director/Board Member | 2022-05-02 |
| VALERO ENERGY CORPORATION | Chief Executive Officer | 2014-04-30 |
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Training of William Klesse
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
63
1st degree connections
17
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 17 |
|---|---|
Occidental Petroleum Corp.
 Occidental Petroleum Corp. Integrated OilEnergy Minerals Explores, develops, produces and markets crude oil & natural gas and basic chemicals | Energy Minerals |
Valero Energy Corp.
 Valero Energy Corp. Oil Refining/MarketingEnergy Minerals Engages in manufacturing and marketing of low-carbon liquid transportation fuels & petrochemical products | Energy Minerals |
Ultramar Diamond Shamrock Corp.
 Ultramar Diamond Shamrock Corp. Oil Refining/MarketingEnergy Minerals Owns and operates petroleum & oil refineries | Energy Minerals |
MEG Energy Corp.
 MEG Energy Corp. Oil & Gas ProductionEnergy Minerals Explores and develops oil sands | Energy Minerals |
Valero Energy Partners LP
 Valero Energy Partners LP Oil & Gas PipelinesIndustrial Services Operates as a transportation fuels company & develops crude oil and refined petroleum products pipelines & terminals | Industrial Services |
University of Dayton
University of Dayton Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
West Texas A&M University
 West Texas A&M University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Muscular Dystrophy Association, Inc.
 Muscular Dystrophy Association, Inc. Hospital/Nursing ManagementHealth Services Conducts research and provides medical services | Health Services |
Southwest Research Institute
 Southwest Research Institute Miscellaneous Commercial ServicesCommercial Services Provides contract research and development services | Commercial Services |
NuStar Energy LP
 NuStar Energy LP Oil & Gas PipelinesIndustrial Services Operate pipelines and terminals for crude oil and refined products | Industrial Services |
United Way of San Antonio & Bexar County
United Way of San Antonio & Bexar County Miscellaneous Commercial ServicesCommercial Services Provides health and human care services | Commercial Services |
Texas Biomedical Research Institute
Texas Biomedical Research Institute Miscellaneous Commercial ServicesCommercial Services Operates as a non-profit biomedical research institution | Commercial Services |
Valero Services, Inc.
 Valero Services, Inc. Personnel ServicesCommercial Services Provides employee leasing services | Commercial Services |
Valero Renewable Fuels Co. LLC
Valero Renewable Fuels Co. LLC Chemicals: SpecialtyProcess Industries Owns and operates ethanol plants | Process Industries |
Valero Energy Partners GP LLC
 Valero Energy Partners GP LLC Financial ConglomeratesFinance Investment Company Vehicle | Finance |
The Briscoe Western Art Museum | |
Christus Santa Rosa Children’s Hospital Foundation |
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