10 Amgen engineering directors
Executive Director Engineering and Director of Engineering are among the roles held by these ten Amgen engineering directors at Amgen. A reader can learn how engineering directors work at Amgen from people who have held the role.
Professionals to explore
Arnab Ganguly
LinkedInExperience: Director of Engineering · Amgen
Arnab Ganguly has been Director of Engineering at Amgen since June 2025, and their headline reads Director Engineering, Drug Product Technologies. They were Assoc. Dir Engineering (2023–2025), Sr Manager Engineering (2023) and Principal Engineer (2020–2022) at Amgen, and the listing shows them as Chair of ASTM E55.05 Subcommittee on Lyophilization at ASTM International since 2018.
Carlos Arroyo
LinkedInExperience: Executive Director Engineering · Amgen
Carlos Arroyo has been Executive Director Engineering at Amgen since December 2023, and their headline reads Executive Director Facilities and Engineering, with the listing placing them in Puerto Rico. They were Director of Manufacturing- Solid Dosage (2019–2023) and Director Of Engineering (2017–2019) at Amgen, and Materials / EHS / Facilities Director (2015–2016) and Production Director (2011–2015) at Boston Scientific.
Fraser Ramsay
LinkedInExperience: Director Of Engineering · Amgen
Fraser Ramsay has been Director Of Engineering at Amgen since March 2022, and the listing places them in Holly Springs, North Carolina. They were Principal Engineer ETA (2015–2022), Manager Engineering (2013–2015), Snr Engineer (2010–2013) and Senior Validation Specialist (2006–2010) at Amgen.
Joe Greeson
LinkedInExperience: Director of Engineering · Amgen
Joe Greeson has been Director of Engineering at Amgen since June 2025, and the listing places them in Thousand Oaks, California. They were a Senior Manager at Amgen (2023–2025), Force Engineer at Naval Special Warfare Command (2020–2024) and Commanding Officer at Officer In Charge of Construction Marianas (2018–2020), and their About section cites building hundreds of facilities across the Continental United States, Guam and overseas.
Nathaniel Shen
LinkedInExperience: Director of Engineering · Amgen
Nathaniel Shen has been Director of Engineering at Amgen since January 2026, with the role based in Singapore. They were Associate Director Manufacturing (2023–2025), Senior Manager Manufacturing (2021–2023), Senior Manager Process Development (2020–2021) and Process Development Manager (2019–2020) at Amgen.
Ronan Hayes
LinkedInExperience: Director of Engineering · Amgen
Ronan Hayes has been Director of Engineering at Amgen since January 2025, and the listing places them in Ireland. They were Associate Director Engineering (2023–2025) and Senior Engineering Manager (2020–2023) at Amgen, and Maintenance & Engineering Manager (Ops) (2013–2020) and Engineering Service Manager (2007–2012) at BOC UK & Ireland; their About section describes an MBA-qualified chemical engineer.
Siddharth Singh
LinkedInExperience: Director of Engineering · Amgen
Siddharth Singh has been Director of Engineering at Amgen since January 2025, and their headline reads Director of Engineering (Process Control) at Amgen. They were Senior Manager - Automation Engineering (2022–2025), Senior Engineer (2019–2022) and Engineer (2016–2019) at Amgen, and a Biopharmaceutical Technologies Co-op at GSK (2015–2016).
Stacey Call
LinkedInExperience: Director, Engineering · Amgen
Stacey Call has been Director, Engineering at Amgen since October 2024, and the listing places them in Apex, North Carolina. They were Facilities & Engineering Senior Director at KBI Biopharma (2022–2024), Engineering and Site Services Director at Catalent (2019–2022), Facilities Engineering Management at Allergan (2016–2019) and Associate VP, NJ-NY Facilities Engineering Operations at Eli Lilly and Company (2004–2016).
Stephen Flavin
LinkedInExperience: Director of Engineering · Amgen
Stephen Flavin has been Director of Engineering at Amgen since March 2025, with the role based in Ireland. They were Associate Director of Engineering (2024–2025) and Principal Engineer (2011–2024) at Amgen, and Senior Process Engineer (2003–2011) and Commissioning Engineer (2003–2008) at Pfizer.
Ulises Core
LinkedInExperience: Director of Engineering · Amgen
Ulises Core has been Director of Engineering at Amgen since March 2025, and their About section reads Formulation/Filling ETA SME & Network Lead. They were Associate Director Engineering -ETA (2024–2025) and Engineering Sr Manager - ETA (2016–2024) at Amgen, and worked in Field Services at BOC Edwards (2000–2004).
Choose the right perspective
Match the person's area, such as facilities and site engineering, drug product technologies, process control and automation, or engineering technical authority for a manufacturing step, to the question you bring. Consider which site each person works at, since the directors here are spread across California, North Carolina, Puerto Rico, Ireland and Singapore.
Questions to take into the conversation
- 01How do you decide when a manufacturing process needs new equipment or a facility change?
- 02What do you look at first when a site's equipment reliability slips?
- 03How does your engineering team share standards and lessons with other sites?
Reaching Amgen engineering directors
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