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
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

Alpha has not published a narrative summary because the current public source set is not sufficient.

Current roles

Appointments & responsibilities

Board appointments

Governance

Board appointments, committee responsibilities and disclosed relationships.

Connections

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

Regeneron Pharmaceuticals

Open Regeneron Pharmaceuticals profile →

Director at Regeneron Pharmaceuticals

1988-01-01 → End not stated

current · source reported

Observed: 2026-09-13

Regeneron Pharmace…Regeneron PharmaceuticalsLeonard S. Schleifer

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 ProxyPublic profile sourceSupports Director at Regeneron Pharmaceuticals (NASDAQ: REGN), Board membership.Open sourceSource 2 · Sec FilingREGN 10-K executive officersSupports AI and ML experience, Cybersecurity experience, Executive company, Executive title, Technology background.Open source

Basis

Identifiers, sources, dates and record limitations.

Identifiers

Alpha ID
alpha:person:leonard-s-schleifer
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
Jul 11, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 11, 2026

AI expertise · Source reportedAI expertise: not identified in the cited filing1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 3, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

AI governance relevance · Source reportedAI governance relevance reported from role and filings1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 3, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Board membership · Source reportedServes on the board of Regeneron Pharmaceuticals1 source
Verification
Source reported
Confidence
85%
Last reviewed
Mar 27, 2026
Cybersecurity experience · Source reportedCybersecurity experience: not identified in the cited filing1 source
Verification
Source reported
Confidence
72%
Last reviewed
Jul 11, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 11, 2026

Executive company · CorroboratedExecutive at Regeneron Pharmaceuticals, Inc.Supported by 2 public records2 sources
Verification
Corroborated
Confidence
94%
Last reviewed
Jul 11, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 11, 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 title · CorroboratedExecutive title: Chief Executive OfficerSupported by 2 public records2 sources
Verification
Corroborated
Confidence
94%
Last reviewed
Jul 11, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 11, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

Technology background · Source reportedTechnology background: not identified in the cited filing1 source
Verification
Source reported
Confidence
72%
Last reviewed
Jul 11, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 11, 2026

View all sources3 records
  1. https://www.sec.gov/Archives/edgar/data/872589/000130817926000340/regn-20260424.htm

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

    Supports: Director at Regeneron Pharmaceuticals (NASDAQ: REGN) · Board membership

  2. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed Jul 11, 2026

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

  3. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 3, 2026

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