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
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

John Kastelein, M.D., Ph.D. FESC, has served as Chief Scientific Officer and non-executive director since November 2022. He co-founded NewAmsterdam Pharma in 2020 and is an emeritus professor of medicine and former chair of the department of vascular medicine at the Academic Medical Center of the University of Amsterdam.

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

NewAmsterdam Pharma Co N.V.

2022-01-01 · current

Confirmed by public sourceView source

Connections

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

NewAmsterdam Pharma Co N.V.

Open NewAmsterdam Pharma Co N.V. profile →

Director at NewAmsterdam Pharma Co N.V.

2022-01-01 → End not stated

current · source reported

Observed: 2026-09-25

NewAmsterdam Pharm…NewAmsterdam Pharma Co N.V.John Kastelein, M.…

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 FilingNAMS 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:john-kastelein-m-d-ph-d-fesc
Record version
public-0

Published evidence records

3 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. NAMS DEF 14A director slate

    sec filing · Source published: May 8, 2025 · Retrieved: May 16, 2026

    Supports 7 claims
    • AI and ML experience: AI and ML experience: not identified in the cited filing · Claim reviewed: May 16, 2026
    • Board role: Board role: Director · Claim reviewed: May 16, 2026
    • Committee assignments: No committee assignment disclosed 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 NewAmsterdam Pharma Company N.V. · Claim reviewed: May 16, 2026
    • Executive title: Executive title: Chief Scientific Officer · Claim reviewed: May 16, 2026
    • Technology background: Technology background: not identified in the cited filing · Claim reviewed: May 16, 2026

  2. Open source

    sec proxy · Source published: May 8, 2025 · Retrieved: Apr 28, 2026

    Supports 1 claim
    • Professional Role: Director at NewAmsterdam Pharma Co N.V. · Claim reviewed: May 16, 2026

  3. Open source

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

    Supports 1 claim
    • Board membership: Serves on the board of NewAmsterdam Pharma Co N.V. · Claim reviewed: May 16, 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 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 2026

Board membership · Source reportedServes on the board of NewAmsterdam Pharma Co N.V.1 source
Verification
Source reported
Confidence
Not stated
Last reviewed
Not stated
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 reportedNo committee assignment disclosed in the cited filing1 source
Verification
Source reported
Confidence
88%
Last reviewed
May 16, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 16, 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

Executive company · Source reportedExecutive at NewAmsterdam Pharma Company N.V.1 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: Chief Scientific Officer1 source
Verification
Source reported
Confidence
85%
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 sources3 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. https://www.sec.gov/Archives/edgar/data/1936258/000119312525115995/d904380ddef14a.htm

    Sec Proxy · Tier not stated · Reviewed Apr 28, 2026

    Supports: Director at NewAmsterdam Pharma Co N.V. (NASDAQ: NAMSW)

  3. https://www.sec.gov/Archives/edgar/data/1936258/000119312525115995/d904380ddef14a.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership