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Global Clinical
​​​​​​​Trial Operations

Our clinical journey for patients

Global Clinical Trial Operations (GCTO) oversees all operations involved in executing clinical studies for biologics, vaccines, and small molecules. We are a global purpose-driven team dedicated to our mission of saving and improving lives. Our commitment to patients guides everything we do.

How we work

Our work is guided by principles of quality, innovation, adaptability, and partnership. GCTO is a people-focused organization that fosters a flexible, diverse, inclusive, and collaborative workplace. Our colleagues are supported throughout their career, from onboarding to training and development. We also provide resources for working remotely, staying well, volunteering, and more.
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Our story by the numbers

Annually, GCTO manages approximately:
280
Late-stage development clinical trials
145
External collaboration and joint venture studies
14k
Active sites
50k
Active patients
100k
Monitoring visits
160m
Clinical data points

Hear from our employees who Invent for Life every day

Our legacy and commitment, through philanthropy, to address complex global health challenges and improve the quality of life in communities inspires me!

Adrelia Allen
Director, Clinical Operations

It is a privilege to work with a dedicated team in Clinical Sciences and Study Management Oncology who are passionate about our mission: to help improve the lives of our patients around the world with our novel medicines.

Andrea Perrone
AVP, Clinical Operations

I am truly inspired to come to work every day because I feel that I work for an ethical company, and I have a direct impact on the health and well-being of humankind.

Chanelle McCullum
Director Clinical Research, Portfolio Sourcing & Relationship Management 

I’m proud to work with a company that not only understands the importance of the science behind what we do, but that also recognizes its people who ultimately matter most.

Brian D. Geldziler, PhD
Director Clinical Operations, Medical Writing 

One’s career is a journey of defining moments. Embracing the teachable moments of that journey fuels my passion to authentically lead with integrity, operate in excellence, and generously extend compassion.

Kathy Taylor
Director, Clinical Operations

Here, we have a long history in working to improve people’s lives. I am proud to continue that legacy with our work in the vaccine and infectious disease areas.

Elizabeth Desrosiers
Executive Director, Clinical Operations

You’ll be valued here as part of a Medical Writing team that supports the translation of breakthrough research into medicines that save and extend life.

Joan Affleck
AVP, Clinical Operations

In Global Data Management and Standards (GDMS) – we are charged with delivering accurate and reliable Clinical Safety & Efficacy to stakeholders who use that data to make important decisions that positively impact patients all over the globe. Data is our currency – and in GDMS, we make a difference.

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Chris Lamplugh
AVP, Clinical Operations

The work that we do matters. Every day, the clinical trials that we run bring life-changing medicines one step closer to market.

Aldona DiSandro
Associate Specialist, Clinical Research, Monitoring Management 

Our Medical Writing team is at the forefront of innovating the clinical documentation process to improve quality, increase compliance, and accelerate time-to-market of important medicines to help save and improve patient lives.

Meredith Murray
Principal Scientist, Clinical Operations

Here, Clinical Research is incredibly innovative and novel clinical trials are driven by an amazing team of enabled, empowered, and talented individuals.

Michelle Metry
Executive Director, Clinical Research

I’m humbled by and proud of the tremendous work done by our skilled and dedicated colleagues around the globe, executing the highest quality clinical research every day and bringing treatments to patients with unmet medical needs.

Andy Lee
Sr. Vice President and Head, Global Clinical Trial Operations

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This careers website is intended for Residents of the United States, Canada & Puerto Rico. Residents in other markets, please visit our MSD Careers page. Information on this site is for the purpose of presenting career opportunities at our organization and give our audience a view of our culture, diversity and growth opportunities. Our Company is an equal opportunity employer, Minority/Female/Disability/Veteran, proudly embracing diversity in all of its manifestations.