Structured intelligence coverage

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

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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

Serial entrepreneur and technologist with more than three decades of experience at the intersection of technology, quantitative investing and capital markets. Co-founded five startups and previously served as Managing Director at Two Sigma Investments.

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

Host Hotels & Resorts

Current · start date not disclosed

Confirmed by public sourceView source

Connections

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

Host Hotels & Resorts

Open Host Hotels & Resorts profile →

Director at Host Hotels & Resorts

Start not stated → End not stated

current · source reported

Observed: 2026-09-25

Host Hotels & Reso…Host Hotels & ResortsAlexander Stein

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 FilingHST DEF 14A director slateSupports AI and ML experience, Board role, Committee assignments, Executive company, Executive title, Cybersecurity experience, Technology background.Open sourceSource 2 · Sec FilingZKPW 10-K executive officersSupports AI and ML experience, Cybersecurity experience, Executive company, Executive title, Other Company Role, Technology background.Open sourceSource 3 · Sec FilingHost Hotels & Resorts, Inc. director board sourceSupports Board membership, Board independence.Open source

Basis

Identifiers, sources, dates and record limitations.

Identifiers

Alpha ID
alpha:person:a-william-stein
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. HST DEF 14A director slate

    sec filing · Source published: Apr 8, 2026 · Retrieved: May 16, 2026

    Supports 7 claims
    • AI and ML experience: AI and machine learning experience reported in filings · Claim reviewed: May 16, 2026
    • Board role: Board role: Director · Claim reviewed: May 16, 2026
    • Committee assignments: Committee assignments: Audit, Culture and Compensation · Claim reviewed: May 16, 2026
    • Cybersecurity experience: Cybersecurity experience reported in filings · Claim reviewed: May 16, 2026
    • Executive company: Executive at Primary Digital Infrastructure · Claim reviewed: May 16, 2026
    • Executive title: Executive title: Executive Managing Director and Chief Investment Officer · Claim reviewed: May 16, 2026
    • Technology background: Technology background reported in filings · Claim reviewed: May 16, 2026

  2. ZKPW 10-K executive officers

    sec filing · Source published: Mar 25, 2026 · Retrieved: Jul 28, 2026

    Supports 6 claims
    • AI and ML experience: AI and ML experience: not identified in the cited filing · Claim reviewed: May 16, 2026
    • Cybersecurity experience: Cybersecurity experience: not identified in the cited filing · Claim reviewed: May 16, 2026
    • Executive company: Executive at Lafayette Digital Acquisition Corp. I · Claim reviewed: Jul 28, 2026
    • Executive title: Executive title: Independent Director · Claim reviewed: Jul 28, 2026
    • Other Company Role: Alexander Stein is also linked to Liquid Markets Solutions as Chief Executive Officer, North America. · Claim reviewed: May 16, 2026
    • Technology background: Technology background reported in filings · Claim reviewed: May 16, 2026

  3. ZKP 10-K executive officers

    sec filing · Source published: Mar 25, 2026 · Retrieved: May 16, 2026

    Supports 2 claims
    • Executive company: Executive at Lafayette Digital Acquisition Corp. I · Claim reviewed: Jul 28, 2026
    • Executive title: Executive title: Independent Director · Claim reviewed: Jul 28, 2026

  4. ZKPU 10-K executive officers

    sec filing · Source published: Mar 25, 2026 · Retrieved: Jul 28, 2026

    Supports 2 claims
    • Executive company: Executive at Lafayette Digital Acquisition Corp. I · Claim reviewed: Jul 28, 2026
    • Executive title: Executive title: Independent Director · Claim reviewed: Jul 28, 2026

  5. Host Hotels & Resorts, Inc. director board source

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

    Supports 2 claims
    • Board independence: Independent director · Claim reviewed: May 3, 2026
    • Board membership: Serves on the board of Host Hotels & Resorts, Inc. · Claim reviewed: May 3, 2026

  6. Open source

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

    Supports 1 claim
    • Professional Role: Director at Host Hotels & Resorts · Claim reviewed: May 16, 2026

  7. Open source

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

    Supports 1 claim
    • Board membership: Serves on the board of Host Hotels & Resorts, 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 · Under reviewAI and ML experience: not identified in the cited filing1 source
Verification
Under review
Confidence
72%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 28, 2026

AI and ML experience · Under reviewAI and machine learning experience reported in filings1 source
Verification
Under review
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 Host Hotels & Resorts, 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 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

Committee assignments · Source reportedCommittee assignments: Audit, Culture and Compensation1 source
Verification
Source reported
Confidence
88%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

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

    Sec Filing · Tier 3 · Reviewed Jul 28, 2026

Cybersecurity experience · Under reviewCybersecurity experience reported in filings1 source
Verification
Under review
Confidence
72%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

Executive company · CorroboratedExecutive at Lafayette Digital Acquisition Corp. ISupported by 3 public records3 sources
Verification
Corroborated
Confidence
94%
Last reviewed
Jul 28, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 28, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 28, 2026

Executive company · Source reportedExecutive at Primary Digital Infrastructure1 source
Verification
Source reported
Confidence
85%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

Executive title · Source reportedExecutive title: Executive Managing Director and Chief Investment Officer1 source
Verification
Source reported
Confidence
85%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

Executive title · CorroboratedExecutive title: Independent DirectorSupported by 3 public records3 sources
Verification
Corroborated
Confidence
94%
Last reviewed
Jul 28, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 28, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 28, 2026

Other Company Role · Source reportedAlexander Stein is also linked to Liquid Markets Solutions as Chief Executive Officer, North America.1 source
Verification
Source reported
Confidence
70%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 28, 2026

Technology background · CorroboratedTechnology background reported in filingsSupported by 2 public records2 sources
Verification
Corroborated
Confidence
72%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 28, 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 · Executive company · Executive title · Cybersecurity experience · Technology background

  2. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 28, 2026

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

  3. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

    Supports: Executive company · Executive title

  4. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 28, 2026

    Supports: Executive company · Executive title

  5. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

    Supports: Board membership · Board independence

  6. https://www.sec.gov/Archives/edgar/data/1070750/000107075025000079/hst-20250402.htm

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

    Supports: Director at Host Hotels & Resorts (NASDAQ: HST)

  7. https://www.sec.gov/Archives/edgar/data/1070750/000107075025000079/hst-20250402.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership