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

Senior Partner and Associate Director at Mazars (Shenzhen Branch) since 2000. Founded and serves as Chairman of Shenzhen Zhonghuan Certified Public Accountants Co., Ltd since 2009. CPA in China with extensive accounting background.

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

Amphastar Pharmaceuticals, Inc.

1996-01-01 · current

Confirmed by public sourceView source

Connections

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

Amphastar Pharmaceuticals, Inc.

Open Amphastar Pharmaceuticals, Inc. profile →

Director at Amphastar Pharmaceuticals, Inc.

1996-01-01 → End not stated

current · source reported

Observed: 2026-09-15

Amphastar Pharmace…Amphastar Pharmaceuticals, Inc.Jun Zhang

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 FilingAMPH DEF 14A director slateSupports AI and ML experience, Board role, Committee assignments, Executive company, Executive title, Cybersecurity experience, Technology background.Open sourceSource 2 · Sec FilingALIS 10-K executive officersSupports AI and ML experience, Cybersecurity experience, Executive company, Executive title, Other Company Role, Technology background.Open sourceSource 3 · Sec FilingADVB 10-K executive officersSupports Executive company, Executive title.Open source

Basis

Identifiers, sources, dates and record limitations.

Identifiers

Alpha ID
alpha:person:jack-yongfeng-zhang-2
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 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Board membership · Source reportedServes on the board of Amphastar Pharmaceuticals, Inc.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 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Committee assignments · Source reportedNo committee assignment disclosed in the cited filing1 source
Verification
Source reported
Confidence
88%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Cybersecurity experience · CorroboratedCybersecurity experience: not identified in the cited filingSupported by 2 public records2 sources
Verification
Corroborated
Confidence
72%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Executive company · Source reportedExecutive at Advanced Biomed Inc.1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Executive company · Source reportedExecutive at Amphastar Pharmaceuticals, Inc.1 source
Verification
Source reported
Confidence
85%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Executive company · Source reportedExecutive at Calisa Acquisition Corp1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Executive title · Source reportedExecutive title: Chief Executive Officer1 source
Verification
Source reported
Confidence
85%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Executive title · Source reportedExecutive title: Independent Director1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Executive title · Source reportedExecutive title: Independent Director and Chair of the Audit Committee1 source
Verification
Source reported
Confidence
94%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Other Company Role · Source reportedJun Zhang is also linked to Shenzhen Zhonghuan Certified Public Accountants Co., Ltd as Chairman.1 source
Verification
Source reported
Confidence
70%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

Technology background · CorroboratedTechnology background: not identified in the cited filingSupported by 2 public records2 sources
Verification
Corroborated
Confidence
72%
Last reviewed
May 15, 2026
  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

  • SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

View all sources5 records
  1. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 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/1297184/000129718426000023/amph-20260601xdef14a.htm

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

    Supports: Director at Amphastar Pharmaceuticals, Inc. (NASDAQ: AMPH)

  3. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

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

  4. SEC EDGAR

    Sec Filing · Tier 3 · Reviewed May 15, 2026

    Supports: Executive company · Executive title

  5. https://www.sec.gov/Archives/edgar/data/1297184/000129718426000023/amph-20260601xdef14a.htm

    Public Source · Tier not stated · Reviewed Not stated

    Supports: Board membership