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
Not establishedNo committee role is currently confirmed by the cited sources
Qualifications
Not establishedNo qualification is currently confirmed by the cited sources

Professional narrative

About

Stephen D. Kelley currently serves as President and CEO of Advanced Energy and has more than 30 years of experience in the global semiconductor and electronics industry. He previously served as President and CEO of Amkor Technology and held executive roles at Cree, Texas Instruments, Philips Semiconductors, National Semiconductor, and Motorola.

Sources are shown with the information they support.

Current roles

Appointments & responsibilities

Board appointments

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

ONTO INNOVATION INC.

2023-01-01 · current

Confirmed by public sourceView source

Director

ADVANCED ENERGY INDUSTRIES INC

2021-01-01 · current

Confirmed by public sourceView source

Connections

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

ADVANCED ENERGY INDUSTRIES INC

Open ADVANCED ENERGY INDUSTRIES INC profile →

Director at ADVANCED ENERGY INDUSTRIES INC

2021-01-01 → End not stated

current · source reported

Observed: 2026-09-21

ADVANCED ENERGY IN…ADVANCED ENERGY INDUSTRIES INCONTO INNOVATION INC.ONTO INNOVATION INC.Stephen D. Kelley

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 FilingMDGL DEF 14A executive officersSupports Executive company, Executive title.Open sourceSource 2 · Sec ProxyPublic profile sourceSupports Director at ONTO INNOVATION INC. (NYSE: ONTO).Open sourceSource 3 · Sec FilingAEIS 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:stephen-d-kelley
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 · CorroboratedAI and ML experience: not identified in the cited filingSupported by 2 public records2 sources
Verification
Corroborated
Confidence
72%
Last reviewed
May 6, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

AI expertise · Under reviewAI expertise: not identified in the cited filing1 source
Verification
Under review
Confidence
94%
Last reviewed
May 3, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

AI expertise · Under reviewAI expertise reported in filings1 source
Verification
Under review
Confidence
94%
Last reviewed
May 3, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

AI governance relevance · CorroboratedAI governance relevance reported from role and filingsSupported by 2 public records2 sources
Verification
Corroborated
Confidence
94%
Last reviewed
May 3, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Board independence · Source reportedNot independent (executive director)1 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 Advanced Energy IndustriesSupported by 3 public records2 sources
Verification
Corroborated
Confidence
95%
Last reviewed
May 3, 2026
Board membership · CorroboratedServes on the board of ONTO INNOVATION INC.Supported 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 6, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

Committee assignments · Source reportedNo committee assignment disclosed in the cited filing1 source
Verification
Source reported
Confidence
88%
Last reviewed
May 6, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

Cybersecurity experience · CorroboratedCybersecurity experience: not identified in the cited filingSupported by 2 public records2 sources
Verification
Corroborated
Confidence
72%
Last reviewed
May 6, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

Executive company · CorroboratedExecutive at Advanced Energy Industries, Inc.Supported by 3 public records3 sources
Verification
Corroborated
Confidence
94%
Last reviewed
May 6, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Executive company · CorroboratedExecutive at Madrigal PharmaceuticalsSupported by 2 public records2 sources
Verification
Corroborated
Confidence
94%
Last reviewed
May 3, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 1, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Executive function · Source reportedEnterprise Leadership (CEO)1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 3, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Executive function · Source reportedLegal Governance (GENERAL_COUNSEL)1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 3, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Executive title · CorroboratedExecutive title: Executive Vice President and Chief Legal CounselSupported by 2 public records2 sources
Verification
Corroborated
Confidence
94%
Last reviewed
May 3, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 1, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Executive title · Source reportedExecutive title: President and Chief Executive Officer1 source
Verification
Source reported
Confidence
85%
Last reviewed
May 6, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

Executive title · CorroboratedExecutive title: President, Chief Executive Officer and DirectorSupported by 2 public records2 sources
Verification
Corroborated
Confidence
94%
Last reviewed
May 6, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Other Company Role · Source reportedSTEPHEN KELLEY is also linked to ONTO Innovation Inc. as Board of Directors.1 source
Verification
Source reported
Confidence
70%
Last reviewed
Apr 29, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

Technology background · CorroboratedTechnology background reported in filingsSupported by 2 public records2 sources
Verification
Corroborated
Confidence
72%
Last reviewed
May 6, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

View all sources10 records
  1. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 1, 2026

    Supports: Executive company · Executive title

  2. https://www.sec.gov/Archives/edgar/data/704532/000119312526143699/onto-20260406.htm

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

    Supports: Director at ONTO INNOVATION INC. (NYSE: ONTO)

  3. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

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

  4. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 6, 2026

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

  5. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

    Supports: Board membership · Director since · Board independence

  6. https://www.sec.gov/Archives/edgar/data/927003/000110465926035159/aeis-20260507xdef14a.htm

    Sec Proxy · Tier not stated · Reviewed Apr 24, 2026

    Supports: Director at ADVANCED ENERGY INDUSTRIES INC (NASDAQ: AEIS)

  7. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

    Supports: AI expertise · AI governance relevance · Executive company · Executive function · Executive title

  8. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

    Supports: AI expertise · AI governance relevance · Executive company · Executive function · Executive title

  9. https://www.sec.gov/Archives/edgar/data/704532/000119312526143699/onto-20260406.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership

  10. https://www.sec.gov/Archives/edgar/data/927003/000110465926035159/aeis-20260507xdef14a.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership