Structured intelligence coverage

Structured records are temporarily unavailable. The published profile and its source ledger remain accessible.

Identity checks do not refresh the age of governance evidence. Open a record for its source date and review state.

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
22 current organizations shown on this profile
Board positions
22 supported by public sources, 0 supplied by the profile owner
Committee roles
3Roles supported by the sources cited on this profile
Qualifications
Not establishedNo qualification is currently confirmed by the cited sources

Professional narrative

About

Retired President and CEO of National Fuel Gas Company, a diversified energy company, with more than 40 years experience in both regulated and non-regulated gas business. Began career as an attorney with National Fuel, bringing legal knowledge and experience to the Board.

Sources are shown with the information they support.

Current roles

Appointments & responsibilities

Board appointments

Independent Director

CMS Energy (NYSE: CMS-PC)

Jan 1, 2019 – Present

Independence: Independent

Source effective: 2026-03-26 · Observed: 2026-05-03T01:32:00.866+00:00

confirmedView source

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.

Independent Director

CMS Energy

2019-01-01 · current

Confirmed by public sourceView source

Director

NATIONAL FUEL GAS CO

2014-01-01 · current

Confirmed by public sourceView source

Connections

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

CMS Energy

Open CMS Energy profile →

Independent Director at CMS Energy

2019-01-01 → End not stated

current · source reported

Observed: 2026-09-24

CMS EnergyCMS EnergyNATIONAL FUEL GAS CONATIONAL FUEL GAS CORonald J. Tanski

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 FilingCMS DEF 14A director slateSupports AI and ML experience, Board role, Committee assignments, Cybersecurity experience, Technology background.Open sourceSource 2 · Sec ProxyPublic profile sourceSupports Director at NATIONAL FUEL GAS CO (NYSE: NFG).Open sourceSource 3 · Sec FilingCMS Energy Corporation director board sourceSupports Board membership, Committee assignments, Director since, Board independence.Open source

Basis

Identifiers, sources, dates and record limitations.

Identifiers

Alpha ID
alpha:person:ronald-j-tanski
Record version
public-0

Published evidence records

6 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. CMS DEF 14A director slate

    sec filing · Source published: Mar 26, 2026 · Retrieved: May 16, 2026

    Supports 5 claims
    • AI and ML experience: AI and ML experience: not identified in the cited filing · Claim reviewed: May 16, 2026
    • Board role: Board role: Director · Claim reviewed: May 16, 2026
    • Committee assignments: Committee assignments: Compensation and Human Resources, Finance, Executive · Claim reviewed: May 16, 2026
    • Cybersecurity experience: Cybersecurity experience: not identified in the cited filing · Claim reviewed: May 16, 2026
    • Technology background: Technology background: not identified in the cited filing · Claim reviewed: May 16, 2026

  2. Open source

    sec proxy · Source published: Mar 26, 2026 · Retrieved: May 3, 2026

    Supports 1 claim
    • Professional Role: Independent Director at CMS Energy · Claim reviewed: May 16, 2026

  3. Open source

    sec proxy · Source published: Jan 23, 2026 · Retrieved: Jul 12, 2026

    Supports 1 claim
    • Professional Role: Director at NATIONAL FUEL GAS CO · Claim reviewed: May 16, 2026

  4. CMS Energy Corporation director board source

    sec filing · Source published: Mar 20, 2025 · Retrieved: May 3, 2026

    Supports 4 claims
    • Board independence: Independent director · Claim reviewed: May 3, 2026
    • Board membership: Serves on the board of CMS Energy Corporation · Claim reviewed: May 3, 2026
    • Board membership: Serves on the board of NATIONAL FUEL GAS CO · Claim reviewed: May 3, 2026
    • Committee assignments: No committee assignment disclosed in the cited filing · Claim reviewed: May 3, 2026

  5. Open source

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

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

  6. Open source

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

    Supports 1 claim
    • Board membership: Serves on the board of NATIONAL FUEL GAS CO · 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 · Source reportedAI and ML experience: not identified in the cited filing1 source
Verification
Source reported
Confidence
72%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 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 CMS Energy CorporationSupported by 3 public records2 sources
Verification
Corroborated
Confidence
95%
Last reviewed
May 3, 2026
Board membership · CorroboratedServes on the board of NATIONAL FUEL GAS COSupported by 2 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 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 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: Compensation and Human Resources, Finance, Executive1 source
Verification
Source reported
Confidence
88%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

Cybersecurity experience · Source reportedCybersecurity experience: not identified in the cited filing1 source
Verification
Source reported
Confidence
72%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

Technology background · Source reportedTechnology background: not identified in the cited filing1 source
Verification
Source reported
Confidence
72%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

View all sources6 records
  1. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

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

  2. https://www.sec.gov/Archives/edgar/data/811156/000081115626000015/cms-20260326.htm

    Sec Proxy · Tier not stated · Reviewed May 3, 2026

    Supports: Independent Director at CMS Energy (NYSE: CMS-PC)

  3. https://www.sec.gov/Archives/edgar/data/70145/000119312526020739/d851067ddef14a.htm

    Sec Proxy · Tier not stated · Reviewed Jul 12, 2026

    Supports: Director at NATIONAL FUEL GAS CO (NYSE: NFG)

  4. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

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

  5. https://www.sec.gov/Archives/edgar/data/811156/000081115626000015/cms-20260326.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership

  6. https://www.sec.gov/Archives/edgar/data/70145/000119312526020739/d851067ddef14a.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership