Waves breaking against the rocky coast of Barbados, photographed by Jack during his medical elective

Hello, I’m Jack.

Taken during my medical elective at Queen Elizabeth Hospital in Bridgetown, Barbados, 2016.
Jack O’Sullivan

I’m a doctor working to make medical knowledge more accessible around the world.

My work spans health AI and remote medical education, including contributions as a physician collaborator to OpenAI’s HealthBench and HealthBench Professional. I qualified in the UK and now work as a health technology consultant based in Germany, with a background in medical linguistics and the humanities.

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Video © OpenAI, 2026. Excerpt from the film accompanying Improving health intelligence in ChatGPT (18 June 2026). https://openai.com/index/improving-health-intelligence-in-chatgpt/

A physician’s perspective on better health AI.

I was one of the physicians featured in OpenAI’s film about improving health intelligence in ChatGPT.

Watch the full film from OpenAI

I started with words.

My first degree was in Creative Writing and English Literature in the UK. During my studies, I specialised in medical linguistics, exploring the history of medicine through its language. My dissertation examined the etymology of medical terminology, tracing the Ancient Greek and Latin roots of terms used internationally in medicine today.

That growing interest in medicine led me to pursue it after graduating with a first-class degree. Writing has remained part of my life, including poetry published by NASA’s Chandra X-ray Observatory, and the humanities continue to shape how I think about ethics, language and uncertainty.

Then came medicine.

I studied medicine at Durham and Newcastle Universities. While there, I taught fellow medical students as an anatomy demonstrator, published research in the Journal of Anatomy and presented at surgical and medical education conferences.

I went on to work on the frontline of the UK’s National Health Service (NHS), including at the Royal Victoria Infirmary and the Freeman Hospital in Newcastle upon Tyne. My clinical experience centres on caring for patients in busy acute and emergency departments, with a particular interest in acute internal medicine.

I’ve also contributed to clinical audit and service evaluation, including a review of cancer management in an NHS Trust. I served through the COVID-19 pandemic as part of the NHS, whose service was collectively recognised by the late Queen Elizabeth II with the award of the George Cross.

Helping healthcare professionals learn.

After my time on the frontline, I joined a German edtech startup founded by a former McKinsey & Company director with a background in digital transformation. I moved to Germany to develop remote and blended medical education with an international clinical team, using collaborative, problem-based learning under the supervision of Maastricht University.

As a freelance Product Lead for Geeky Medics, a British medical education company, I led an international team of freelance doctors and medical students and worked directly with the CEO and engineering team on the development and improvement of AI-powered Virtual Patients, enabling healthcare students to practise simulated clinical encounters remotely.

As an independent consultant for AMBOSS, I helped produce a study guide for the UK Medical Licensing Assessment, supporting the company’s expansion into the UK. Its medical education and clinical reference platform serves more than a million healthcare professionals in over 180 countries.

A clinical eye on health AI.

I continue to evaluate health AI alongside an ongoing Physician Advisor role. I bring clinical judgement to how AI handles healthcare tasks, with attention to accuracy, context and usefulness. This includes contributions to OpenAI’s health efforts as an independent contractor through micro1, and previously GreenLight.

I’m acknowledged as a physician collaborator on HealthBench and HealthBench Professional. Developed with 262 physicians worldwide, HealthBench evaluates AI responses across 5,000 realistic health conversations using physician-written criteria. HealthBench Professional focuses on clinical care, medical research and documentation from a practitioner’s perspective. I’m also featured in OpenAI’s film exploring how physicians contribute to improving health intelligence in ChatGPT.

I also contributed as one of the independent physicians working on OpenAI’s study with Penda Health in Nairobi, Kenya, evaluating a clinical AI copilot across almost 40,000 patient visits. The study found lower diagnostic and treatment error rates among clinicians using the copilot.

My consulting work

Across medicine, language and technology, my aim is the same: helping good care reach more people.

I help teams make health technology useful and understandable, bringing clinical judgement and close attention to detail. I’m committed to taking that work further, and welcome opportunities to widen access to care and medical education, especially for underserved communities.

Have something in mind?

I welcome enquiries about medical education, clinical content and health technology product development. I consider new engagements individually to ensure they are compatible with my existing professional commitments.

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