Phelim Bradley in

Phelim Bradley

Inquirer · DISC type cd
Venture Partner at Pioneer Fund
📍 London, England, United Kingdom

Phelim Bradley is the Cofounder and CEO of Prolific, a Y Combinator-backed platform revolutionizing research by connecting scientists and AI developers with vetted human participants. With a DPhil in Genomic Medicine and Statistics from Oxford, he transitioned from CTO to CEO, leading Prolifics growth in providing high-quality, ethically-sourced data.

Outside of his professional life, Phelim is described as an avid Irish Rugby supporter, a whisky drinker, and an amateur yogi. His academic and professional journey reflects a deep-seated interest in leveraging data to solve complex problems, from genetics to artificial intelligence.

His company, Prolific, recently won the Allstar Company Challenge at the GP Bullhound Allstars Awards 2025.

Read the full overview →
Experience
12 Years
Current Role
Venture Partner
Job Level
Leadership
Location
London, England, United Kingdom
Personality Overview

How Phelim shows up

Hard To Convince
Judgemental
ROI Conscious

They don’t always try to control the conversation but neither do they like yielding it fully. They can be nudged to make faster decisions by offering what they value. They respond well to confident salespeople.

Priorities

Topics Phelim cares about

Human Data in AI
He emphasizes the critical role of high-quality, diverse, and ethically sourced human feedback for training safe, effective, and unbiased AI models.
AI Evaluation
He recently launched HUMAINE, a benchmark built on human research methodology to capture true user preference for AI performance, going beyond technical metrics.
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Career

Work history

11-2023
Venture Partner
Pioneer Fund
10-2021
CEO
Prolific
4-2014 - 10-2021
CTO
Prolific
DPhil – Genomic Medicine and Statistics
Wellcome Trust Centre for Human Genetics, University of Oxford
5-2013 - 8-2013
Bioinformatics Intern
Illumina
In the press

Media appearances

Prolific: AI Research Startup Raises $32m Funding for US Expansion. Featured in Business Insider
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Education
2019 - 2019
S19
Y Combinator
2013 - 2018
Doctor of Philosophy (PhD)
University of Oxford
Social presence
in
Behavioral profile

DISC profile (public)

c

Calculativeness (C)

Calculativeness (C) reflects the degree to which a person is likely to be cautious, systematic and analytical. Those scoring high tend to emphasise quality and accuracy.

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