Our Team

Meet the people behind ClinicalTrials.co

We’re a team of trial enthusiasts, clinicians, and builders committed to making clinical trials less overwhelming and more accessible for patients and caregivers, starting with clearer education and real guidance at every step

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David Polinsky

Founder

David is the Founder of Clinical Trial Guide and is committed to helping those suffering with major unmet clinical needs. Having spent over twenty years in the pharmaceutical industry David founded CTG to help those seeking information not otherwise readily available.

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Rivka Szafranski

Co-founder & CEO

Rivka is the CEO and Lead Patient Advocate of Clinical Trial Guide. She is a lifelong project manager, a biotech enthusiast, and strives to create a better world by building resources for patients and their families.

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Dr. Jonathan Ringo, M.D.​

Chief Medical Officer​

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Gabriela Márquez​

Product Design

As Product Designer, Gabriela focuses on making clinical trial navigation feel clear and human. She helps turn complex health information into simple, supportive experiences for patients and families

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Roger Jin

Product Advisor

Roger is a product leader and coach who’s worked at the forefront of AI and venture-backed startups. He helped launch Gemini at Google DeepMind, previously led product at Amazon Alexa, and has co-founded two AI startups—raising $20M+ and scaling to $80M+ in annual revenue. He now advises and coaches executives and entrepreneurs

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Stefanie Matteson​

Media Writer

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Advisor Board

John Doe

MEDICAL Advisor

Curabitur pretium vulputate dui sed tempor. Sed convallis leo urna. Nam iaculis elit non sem ornare, sed sagittis velit consequat.

John Doe

MEDICAL Advisor

Curabitur pretium vulputate dui sed tempor. Sed convallis leo urna. Nam iaculis elit non sem ornare, sed sagittis velit consequat.

John Doe

MEDICAL Advisor

Curabitur pretium vulputate dui sed tempor. Sed convallis leo urna. Nam iaculis elit non sem ornare, sed sagittis velit consequat.

John Doe

MEDICAL Advisor

Curabitur pretium vulputate dui sed tempor. Sed convallis leo urna. Nam iaculis elit non sem ornare, sed sagittis velit consequat.