FDA Investigator

Jacek Cieslak

Latest inspection on record: Kita, Japan, March 2024 · records back to 2018

Human Drugs

FDA inspection record · Last updated July 12, 2026

Overview

  • 12 inspections across 11 sites are on record.
  • 1 Form 483 observation is attributed to this investigator.
  • Most recent recorded activity is 2024-03-29.

At a glance

Inspections

12

Sites

11

Observations

1

Career since

Jul 2018

Recent inspections

Most recent inspections in the published record.

SiteDateCategoryForm 483
Chugai Pharma Manufacturing Co., Ltd29 Mar 2024Human DrugsOn file
AbbVie Bioresearch Center30 Jan 2024Human DrugsOn file
Samsung Biologics Co., Ltd.1 Sep 2023Human DrugsOn file
Alexion Pharma International Operations Limited24 Jan 2023Human DrugsOn file
SEAGEN INC.10 Jun 2022Human DrugsOn file

Sites inspected

Chugai Pharma Manufacturing Co., LtdKita, Japan1 insp.
AbbVie Bioresearch CenterWorcester, United States1 insp.
Samsung Biologics Co., Ltd.Yeonsu District, Korea (the Republic of)1 insp.
Alexion Pharma International Operations LimitedDublin 15, Ireland1 insp.
SEAGEN INC.Bothell, United States1 insp.

Co-investigators

Investigators who share inspections with this person.

Zhong Li3 shared
Michael Shanks3 shared
Hyung-Yul Lee1 shared
Dogbeda F Mackenzie1 shared
Wendy G Tan1 shared

Full investigator report

Get the verbatim findings behind Jacek Cieslak's 1 observation

Source 483 PDFs, verbatim observations, and how each site responded, so your team knows what they cite before they arrive.

  • New inspections and Form 483s, mapped to the CFR citation
  • Warning letter outcomes, and the citation patterns they repeat
  • Their co-investigators, so no surprises about who shows up on site

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