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John Walker Email & Phone Number
Senior Process Scientist
at
Pfizer
LinkedIn matched
✓ Verified May 2026
3 data sources
Profile completeness 86%
Current company
Role
Senior Process Scientist
Location
Dublin, County Dublin, Ireland
Company size
Who is John Walker? Overview
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Quick answer
John Walker is listed as Senior Process Scientist at Pfizer, a company with 100690 employees, based in Dublin, County Dublin, Ireland. AeroLeads shows a matched LinkedIn profile for John Walker.
John Walker previously worked as NPI Upstream SME at Pfizer and Upstream Scientist, Process Sciences - Investigation Support, Design of Experiment at Msd Ireland. John Walker holds Master Of Science - Ms, Cellular Manufacturing And Therapy, First Class Honours from National University Of Ireland, Galway.
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Pfizer
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Profile bio
About John Walker
I am an Upstream Process Scientist with 5 years of experience in aseptic cell culture reducing risk and loss of product, providing training, allowing for new starts to achieve right first-time results. Writing of complex documentation such as contamination control strategies, process simulations vital to tech transfer of processes and facilitating successful audits, allowing for manufacture of quality products for patients in need. You can reach me via IM here on LinkedIn or via email at johnwalker123@hotmail.com.I've completed a bachelor's degree in Biomedical Sciences from Maynooth University and a Master's Degree in Cellular Manufacturing and Therapy from National University of Ireland, Galway.My major interests for work revolve around aseptic technique, deviation resolution, root cause analysis, training, process engineering, change control management. I've worked with CHO cells for large-scale manufacturing using bioreactors as well as Mesenchymal Stem Cells in a flask-based manual process, from isolation of cells from adipose tissue to final product filling. I have a wide and varied range of experience in other areas such as equipment qualification, process qualification and process validation.Competencies: GMP, Protocol Generation and Execution, Cell Culture, Stem Cell Manufacturing SME, Cell Cryopreservation, Harvesting, Documentation Generation, Aseptic Technique, Continuous ImprovementOutside of work I enjoy music, gaming, Formula 1, Rugby and Tennis.
Current workplace
John Walker's current company
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Pfizer
7 roles
John Walker work experience
A career timeline built from the work history available for this profile.
Npi Upstream Sme
Current
Jun 2024 - Present
Upstream Scientist, Process Sciences - Investigation Support, Design Of Experiment
Development and implementation of a comprehensive small-scale model of a small-scale mammalian-cell (CHO) process, enabling optimization of key process parameters and driving a robust troubleshooting environment for large-scale deviations.Optimized aseptic cell culture procedures, maintaining 3L bioreactors to ensure comparability with large-scale.
Jun 2021 - May 2024
Plant Technologist - Regenerative Medicines, Deviation And Change Control Management
Developed and executed a comprehensive tech transfer plan for a groundbreaking Stem Cell Manufacturing process, resulting in the successful implementation of the process type in Ireland for the first time. Led and facilitated tech transfer activities, including training, documentation creation, and execution of engineering and process validation runs.
Oct 2018 - Jun 2021
Graduate Student - Cleanroom Maintenance, Cleaning Validation
The primary objective of this course is to provide formal training in cellular bioprocessing for clinical application for those who wish to study key emerging technologies for medical intervention. The course is designed according to Good Manufacturing Practices and provides a rigorous scientific underpinning for the development of a cellular therapy.
Sep 2017 - Sep 2018
Laboratory Aide
Galway Blood And Tissue Establishment, Uhg
Work Experience in the Galway Blood and Tissue Establishment. Focusing on Environmental monitoring, material transfer, documentation and cryopreservation.
May 2018 - Aug 2018
Lead Bartender
Worked as a bartender, often leading functions such as outdoor marquee wedding receptions.
May 2017 - Dec 2017
Team & coworkers
Colleagues at Pfizer
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AO
Andy O'Donnell
Colleague at Pfizer
Londonderry, New Hampshire, United States, United States
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KS
Kelly Siemen
Colleague at Pfizer
Kalamazoo, Michigan, United States, United States
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SR
Sarah Refaii
Colleague at Pfizer
Kuwait, Kuwait
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KS
Kim Sley
Colleague at Pfizer
West Palm Beach, Florida, United States, United States
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GT
Georgia Tasiopoulos
Colleague at Pfizer
Burlington, Massachusetts, United States, United States
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PC
Patricia Canaveris
Colleague at Pfizer
Argentina, Argentina
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VK
Vasiliki Kapoli Karakas
Colleague at Pfizer
Kalamariá, Central Macedonia, Greece, Greece
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AM
Antonio Mathews Jr.
Colleague at Pfizer
Greater Tampa Bay Area, United States
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FM
Fabricio Masis Aagesen
Colleague at Pfizer
San José, San Jose, Costa Rica, Costa Rica
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DD
Dan Durst
Colleague at Pfizer
Kenmore, Washington, United States, United States
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Andy O'Donnell
Colleague at Pfizer
Londonderry, New Hampshire, United States, United States
View →
KS
Kelly Siemen
Colleague at Pfizer
Kalamazoo, Michigan, United States, United States
View →
SR
Sarah Refaii
Colleague at Pfizer
Kuwait, Kuwait
View →
KS
Kim Sley
Colleague at Pfizer
West Palm Beach, Florida, United States, United States
View →
GT
Georgia Tasiopoulos
Colleague at Pfizer
Burlington, Massachusetts, United States, United States
View →
PC
Patricia Canaveris
Colleague at Pfizer
Argentina, Argentina
View →
VK
Vasiliki Kapoli Karakas
Colleague at Pfizer
Kalamariá, Central Macedonia, Greece, Greece
View →
AM
Antonio Mathews Jr.
Colleague at Pfizer
Greater Tampa Bay Area, United States
View →
FM
Fabricio Masis Aagesen
Colleague at Pfizer
San José, San Jose, Costa Rica, Costa Rica
View →
DD
Dan Durst
Colleague at Pfizer
Kenmore, Washington, United States, United States
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2 education records
John Walker education
Master Of Science - Ms, Cellular Manufacturing And Therapy, First Class Honours
Bachelor Of Science - Bs, Biological And Biomedical Sciences, 2Nd Class Honours
FAQ
Frequently asked questions about John Walker
Quick answers generated from the profile data available on this page.
What company does John Walker work for?
John Walker works for Pfizer.
What is John Walker's role at Pfizer?
John Walker is listed as Senior Process Scientist at Pfizer.
Where is John Walker based?
John Walker is based in Dublin, County Dublin, Ireland while working with Pfizer.
What companies has John Walker worked for?
John Walker has worked for Pfizer, Msd Ireland, Takeda, National University Of Ireland, Galway, and Galway Blood And Tissue Establishment, Uhg.
Who are John Walker's colleagues at Pfizer?
John Walker's colleagues at Pfizer include Andy O'Donnell, Kelly Siemen, Sarah Refaii, Kim Sley, and Georgia Tasiopoulos.
How can I contact John Walker?
You can use AeroLeads to view verified contact signals for John Walker at Pfizer, including work email, phone, and LinkedIn data when available.
What schools did John Walker attend?
John Walker holds Master Of Science - Ms, Cellular Manufacturing And Therapy, First Class Honours from National University Of Ireland, Galway.
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