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
2Roles supported by the sources cited on this profile
Qualifications
Not establishedNo qualification is currently confirmed by the cited sources

Professional narrative

About

Former Chief Executive Officer of Humana, guided the company through significant expansion, responsible for the company's market capitalization increase from approximately $1.1 billion in 2000 to approximately $12.7 billion at the time of his retirement in 2012. Championed digital healthcare management systems and customer-centric healthcare plans.

Sources are shown with the information they support.

Current roles

Appointments & responsibilities

Board appointments

Director

AT&T (NYSE: T-PC)

Apr 4, 2025 – Present

Independence: Not stated

Source effective: 2025-04-04 · Observed: 2026-05-15T18:59:14.981532+00:00

confirmedView source

Independent Director

Zoetis (NYSE: ZTS)

Jan 1, 2013 – Present

Independence: Independent

Source effective: 2026-04-08 · Observed: 2026-05-03T01:04:00.509+00:00

confirmedView source

Governance

Board appointments, committee responsibilities and disclosed relationships.

Board and advisory record

Board service

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

Director

AT&T

2025-04-04 · current

Confirmed by public sourceView source

Independent Director

Zoetis

2013-01-01 · current

Confirmed by public sourceView source

Connections

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

AT&T

Open AT&T profile →

Director at AT&T

2025-04-04 → End not stated

current · source reported

Observed: 2026-09-21

AT&TAT&TZoetisZoetisMichael B. McCalli…

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.

  • AT&T

    Director

    Verified public fact

  • Zoetis

    Independent Director

    Verified public fact

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 FilingZTS DEF 14A director slateSupports AI and ML experience, Board role, Committee assignments, Cybersecurity experience, Technology background.Open sourceSource 2 · Sec FilingZoetis Inc. director board sourceSupports Board membership, Committee assignments, Director since, Board independence.Open sourceSource 3 · Sec FilingT DEF 14A director slateSupports Board role, Committee assignments.Open source

Basis

Identifiers, sources, dates and record limitations.

Identifiers

Alpha ID
alpha:person:michael-b-mccallister
Record version
public-0

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 AT&TSupported by 2 public records2 sources
Verification
Corroborated
Confidence
95%
Last reviewed
May 3, 2026
Board membership · CorroboratedServes on the board of Zoetis Inc.Supported by 3 public records2 sources
Verification
Corroborated
Confidence
95%
Last reviewed
May 3, 2026
Board role · Source reportedBoard role: Chair1 source
Verification
Source reported
Confidence
92%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

Board role · Source reportedBoard role: Director1 source
Verification
Source reported
Confidence
92%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Committee assignments · CorroboratedNo committee assignment disclosed in the cited filingSupported by 2 public records2 sources
Verification
Corroborated
Confidence
95%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Committee assignments · Source reportedCommittee assignments: Audit, Human Resources1 source
Verification
Source reported
Confidence
88%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 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 sources7 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/1555280/000155528026000015/zts-20260406.htm

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

    Supports: Independent Director at Zoetis (NYSE: ZTS)

  3. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

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

  4. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

    Supports: Board role · Committee assignments

  5. https://www.sec.gov/Archives/edgar/data/732717/000119312525073402/d900144ddef14a.htm

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

    Supports: Director at AT&T (NYSE: T-PC)

  6. https://www.sec.gov/Archives/edgar/data/732717/000119312525073402/d900144ddef14a.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership

  7. https://www.sec.gov/Archives/edgar/data/1555280/000155528026000015/zts-20260406.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership