Structured intelligence coverage

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Profile

Identity, professional record and current appointments.

Overview

Professional record at a glance

A concise summary of information supported by the cited public sources. Missing information is treated as unknown, not as a negative finding.

Current roles
11 current organization shown on this profile
Board positions
11 supported by public sources, 0 supplied by the profile owner
Committee roles
2Roles supported by the sources cited on this profile
Qualifications
Not establishedNo qualification is currently confirmed by the cited sources

Professional narrative

About

Mr. Klesse is the former CEO and Chairman of the Board of Valero Energy Corporation, serving as CEO from 2006 to May 2014 and as Chairman from 2007 until his retirement in December 2014. He began his 45-plus year career in the energy industry at Diamond Shamrock Corporation and held various executive roles at Ultramar Diamond Shamrock before joining Valero. He holds a bachelor's degree in Chemical Engineering from the University of Dayton and an MBA with an emphasis in Finance from West Texas A&M University.

Sources are shown with the information they support.

Current roles

Appointments & responsibilities

Board appointments

Governance

Board appointments, committee responsibilities and disclosed relationships.

Committee appointments across companies · Temporarily unavailable

Structured records for this section are unavailable. This does not establish that no records exist. Published profile sources remain in Evidence & History.

Board and advisory record

Board service

Sources are shown with each role, education record, or credential.

Director

Occidental Petroleum

2013-01-01 · current

Confirmed by public sourceView source

Connections

Explore the roles, education and affiliations published in this record.

Occidental Petroleum

Open Occidental Petroleum profile →

Director at Occidental Petroleum

2013-01-01 → End not stated

current · source reported

Observed: 2026-09-25

Occidental PetroleumOccidental PetroleumWilliam R. Klesse

Dashed lines mark past roles. Select a connection to see its dates and sources.

Relationship map

Connected through the public record

Direct relationships from verified facts and published résumé records. Private connections are excluded.

Direct public links only

Only published affiliations are shown here. Private relationships require authorized access.

Experience

Career history, education, credentials and public contributions.

Published record

Featured coverage

Selected publications and public sources used to establish this profile. Inclusion records provenance; it is not an endorsement.

Source 1 · Sec FilingOXY DEF 14A director slateSupports AI and ML experience, Board role, Committee assignments, Cybersecurity experience, Technology background.Open source

Basis

Identifiers, sources, dates and record limitations.

Identifiers

Alpha ID
alpha:person:william-r-klesse
Record version
public-0

Published evidence records

5 evidence records, matching Agent View. Records may refer to different locations or observations in the same document. This count is not a count of independent corroborating sources.

  1. OXY DEF 14A director slate

    sec filing · Source published: Mar 19, 2026 · Retrieved: May 13, 2026

    Supports 5 claims
    • AI and ML experience: AI and ML experience: not identified in the cited filing · Claim reviewed: May 13, 2026
    • Board role: Board role: Director · Claim reviewed: May 13, 2026
    • Committee assignments: Committee assignments: Environmental, Health and Safety, Compensation · Claim reviewed: May 13, 2026
    • Cybersecurity experience: Cybersecurity experience: not identified in the cited filing · Claim reviewed: May 13, 2026
    • Technology background: Technology background: not identified in the cited filing · Claim reviewed: May 13, 2026

  2. OXY DEF 14A executive officers

    sec filing · Source published: Mar 19, 2026 · Retrieved: May 13, 2026

    Supports 5 claims
    • AI and ML experience: AI and ML experience: not identified in the cited filing · Claim reviewed: May 13, 2026
    • Cybersecurity experience: Cybersecurity experience: not identified in the cited filing · Claim reviewed: May 13, 2026
    • Executive company: Executive at Occidental Petroleum Corporation · Claim reviewed: May 13, 2026
    • Executive title: Executive title: Director · Claim reviewed: May 13, 2026
    • Technology background: Technology background: not identified in the cited filing · Claim reviewed: May 13, 2026

  3. Occidental Petroleum Corporation director board source

    sec filing · Source published: Mar 19, 2026 · Retrieved: May 3, 2026

    Supports 3 claims
    • Board independence: Independent director · Claim reviewed: May 3, 2026
    • Board membership: Serves on the board of Occidental Petroleum Corporation · Claim reviewed: May 3, 2026
    • Committee assignments: No committee assignment disclosed in the cited filing · Claim reviewed: May 3, 2026

  4. Open source

    sec proxy · Source published: Mar 19, 2026 · Retrieved: Mar 23, 2026

    Supports 1 claim
    • Professional Role: Director at Occidental Petroleum · Claim reviewed: May 16, 2026

  5. Open source

    public source · Source published: Date unavailable · Retrieved: Date unavailable

    Supports 1 claim
    • Board membership: Serves on the board of Occidental Petroleum Corporation · Claim reviewed: May 3, 2026

Sources

Sources and published information

Each item links to the public source used to support it. When sources disagree, the item is clearly marked for review.

AI and ML experience · CorroboratedAI and ML experience: not identified in the cited filingSupported by 2 public records2 sources
Verification
Corroborated
Confidence
72%
Last reviewed
May 13, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

Board independence · Source reportedIndependent director1 source
Verification
Source reported
Confidence
95%
Last reviewed
May 3, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Board membership · CorroboratedServes on the board of Occidental Petroleum CorporationSupported by 3 public records2 sources
Verification
Corroborated
Confidence
95%
Last reviewed
May 3, 2026
Board role · Source reportedBoard role: Director1 source
Verification
Source reported
Confidence
92%
Last reviewed
May 13, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

Committee assignments · Source reportedNo committee assignment disclosed in the cited filing1 source
Verification
Source reported
Confidence
95%
Last reviewed
May 3, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Committee assignments · Source reportedCommittee assignments: Environmental, Health and Safety, Compensation1 source
Verification
Source reported
Confidence
88%
Last reviewed
May 13, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

Cybersecurity experience · CorroboratedCybersecurity experience: not identified in the cited filingSupported by 2 public records2 sources
Verification
Corroborated
Confidence
72%
Last reviewed
May 13, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

Executive company · Source reportedExecutive at Occidental Petroleum Corporation1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 13, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

Executive title · Source reportedExecutive title: Director1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 13, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

Technology background · CorroboratedTechnology background: not identified in the cited filingSupported by 2 public records2 sources
Verification
Corroborated
Confidence
72%
Last reviewed
May 13, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

View all sources5 records
  1. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

    Supports: AI and ML experience · Board role · Committee assignments · Cybersecurity experience · Technology background

  2. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 13, 2026

    Supports: AI and ML experience · Cybersecurity experience · Executive company · Executive title · Technology background

  3. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

    Supports: Board membership · Committee assignments · Director since · Board independence

  4. https://www.sec.gov/Archives/edgar/data/797468/000162828026019816/oxy-20260319.htm

    Sec Proxy · Tier not stated · Reviewed Mar 23, 2026

    Supports: Director at Occidental Petroleum (NYSE: OXY-WT)

  5. https://www.sec.gov/Archives/edgar/data/797468/000162828026019816/oxy-20260319.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership