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

Founder, Chairman and CEO of Monumental Sports & Entertainment, LLC since 2010. Previously Vice Chairman Emeritus of AOL LLC from 1994 to 2006. Brings expertise as an innovator and entrepreneur with success in identifying business opportunities and driving strategies based on technology and digital trends.

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

Structured records are unavailable. This does not establish that no records exist.

Board and advisory record

Board service

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

Director

American Express

2025-03-14 · current

Confirmed by public sourceView source

Director

Tempus AI, Inc.

2019-01-01 · current

Confirmed by public sourceView source

Connections

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

American Express

Open American Express profile →

Director at American Express

2025-03-14 → End not stated

current · source reported

Observed: 2026-09-24

American ExpressAmerican ExpressTempus AI, Inc.Tempus AI, Inc.Theodore J. Leonsis

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 FilingTempus AI Inc director board sourceSupports Board membership, Committee assignments, Director since, Board independence.Open sourceSource 2 · Sec FilingAXP DEF 14A director slateSupports AI and ML experience, Board role, Committee assignments, Executive company, Executive title, Cybersecurity experience, Technology background.Open source

Basis

Identifiers, sources, dates and record limitations.

Identifiers

Alpha ID
alpha:person:theodore-j-leonsis
Record version
public-0

Published evidence records

7 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. Tempus AI Inc director board source

    sec filing · Source published: Apr 7, 2026 · Retrieved: May 3, 2026

    Supports 4 claims
    • Board independence: Independent director · Claim reviewed: May 3, 2026
    • Board membership: Serves on the board of American Express · Claim reviewed: May 3, 2026
    • Board membership: Serves on the board of Tempus AI Inc · Claim reviewed: May 3, 2026
    • Committee assignments: No committee assignment disclosed in the cited filing · Claim reviewed: May 3, 2026

  2. TEM DEF 14A director slate

    sec filing · Source published: Apr 7, 2026 · Retrieved: May 8, 2026

    Supports 2 claims
    • Board role: Board role: Director · Claim reviewed: May 15, 2026
    • Committee assignments: Committee assignments: Nominating/Governance, Executive · Claim reviewed: May 8, 2026

  3. Open source

    sec proxy · Source published: Apr 7, 2026 · Retrieved: Apr 30, 2026

    Supports 1 claim
    • Professional Role: Director at Tempus AI, Inc. · Claim reviewed: May 15, 2026

  4. AXP DEF 14A director slate

    sec filing · Source published: Mar 14, 2025 · Retrieved: May 15, 2026

    Supports 7 claims
    • AI and ML experience: AI and ML experience: not identified in the cited filing · Claim reviewed: May 15, 2026
    • Board role: Board role: Director · Claim reviewed: May 15, 2026
    • Committee assignments: Committee assignments: Compensation and Benefits, Nominating/Governance · Claim reviewed: May 15, 2026
    • Cybersecurity experience: Cybersecurity experience: not identified in the cited filing · Claim reviewed: May 15, 2026
    • Executive company: Executive at Monumental Sports & Entertainment, LLC · Claim reviewed: May 15, 2026
    • Executive title: Executive title: Chairman and CEO · Claim reviewed: May 15, 2026
    • Technology background: Technology background reported in filings · Claim reviewed: May 15, 2026

  5. Open source

    sec filing · Source published: Mar 14, 2025 · Retrieved: May 15, 2026

    Supports 1 claim
    • Professional Role: Director at American Express · Claim reviewed: May 15, 2026

  6. Open source

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

    Supports 1 claim
    • Board membership: Serves on the board of American Express · Claim reviewed: May 3, 2026

  7. Open source

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

    Supports 1 claim
    • Board membership: Serves on the board of Tempus AI Inc · 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 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 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 American ExpressSupported by 2 public records2 sources
Verification
Corroborated
Confidence
95%
Last reviewed
May 3, 2026
Board membership · CorroboratedServes on the board of Tempus AI IncSupported by 3 public records2 sources
Verification
Corroborated
Confidence
95%
Last reviewed
May 3, 2026
Board role · CorroboratedBoard role: DirectorSupported by 2 public records2 sources
Verification
Corroborated
Confidence
92%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 8, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 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 Benefits, Nominating/Governance1 source
Verification
Source reported
Confidence
88%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Committee assignments · Source reportedCommittee assignments: Nominating/Governance, Executive1 source
Verification
Source reported
Confidence
88%
Last reviewed
May 8, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 8, 2026

Cybersecurity experience · Source reportedCybersecurity experience: not identified in the cited filing1 source
Verification
Source reported
Confidence
72%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Executive company · Source reportedExecutive at Monumental Sports & Entertainment, LLC1 source
Verification
Source reported
Confidence
85%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Executive title · Source reportedExecutive title: Chairman and CEO1 source
Verification
Source reported
Confidence
85%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Technology background · Source reportedTechnology background reported in filings1 source
Verification
Source reported
Confidence
72%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

View all sources7 records
  1. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

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

  2. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 8, 2026

    Supports: Board role · Committee assignments

  3. https://www.sec.gov/Archives/edgar/data/1717115/000119312526145528/d23945ddef14a.htm

    Sec Proxy · Tier not stated · Reviewed Apr 30, 2026

    Supports: Director at Tempus AI, Inc. (NASDAQ: TEM)

  4. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

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

  5. https://www.sec.gov/Archives/edgar/data/0000004962/000119312525054588/d804836ddef14a.htm

    Sec Filing · Tier not stated · Reviewed May 15, 2026

    Supports: Director at American Express (NYSE: AXP)

  6. https://www.sec.gov/Archives/edgar/data/0000004962/000119312525054588/d804836ddef14a.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership

  7. https://www.sec.gov/Archives/edgar/data/1717115/000119312526145528/d23945ddef14a.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership