The heart rate monitor that helps you pace with POTS

Harry is Co-founder of Visible. An engineer by training, he began his career in Formula 1 and electric vehicles before developing Long Covid in 2020. Despite being seriously unwell, his tests came back normal and his symptoms were attributed to anxiety or deconditioning.

He turned to fitness trackers to better understand his health. But they tracked workouts, not rest, and pushed people to do more, not to pace.

In 2022, he set out to build a wearable designed around the needs of people with complex chronic illness.

His ambition is to transform how we understand and treat these conditions, giving people greater understanding and support for their health while accelerating research towards better treatments and cures.

Oonagh is Brand Lead at Visible. A former professional rower with the British Rowing Team, she was pre-selected for the Tokyo Olympics before developing Long Covid and ME/CFS, which forced her to retire from professional sport.

Her experience led her into research and advocacy. She has spoken widely in the national media about the need for greater scientific understanding and better care, and completed a research fellowship at the University of Oxford studying Long Covid.

At Visible, she brings these experiences together to lead the company’s brand and communications, working to change how complex chronic illness is understood and accelerate progress towards better care and treatments.

Jemma is Social Media Manager at Visible. Before developing Long Covid, she was a secondary school science teacher. Her illness forced her to leave teaching, and she began sharing her experience of chronic illness online.

Today, she is one of the most recognisable voices in the chronic illness community. She has built an audience of hundreds of thousands with her honest, often hilarious take on life with chronic illness.

She brings that same creativity and understanding of chronic illness to Visible, shaping how we reach, connect with and support people living with these conditions.

Ed is Head of Member Support at Visible. Before joining the team, he held a senior leadership role at a London school. After developing Long Covid, he had to leave teaching and became involved in efforts to improve understanding of these poorly understood conditions.

At Visible, he combines his firsthand experience of illness with his background in education to ensure members receive thoughtful, informed support that reflects the realities of living with complex chronic illness.

Janna is Director of Clinical Affairs and Research at Visible. While at college, an Epstein-Barr virus infection left her with severe post-viral fatigue. The experience inspired her to train as a clinical health psychologist to support others living with health challenges.

After earning her PhD, she researched how technology could improve access to evidence-based healthcare for underserved communities. She also established an independent psychology practice supporting people with chronic illness and pain.

At Visible, she works to make evidence-based tools for living with chronic illness more accessible, ensuring they are grounded in science, measuring their impact and helping bring Visible into healthcare settings at little or no cost to patients.

Paul is Head of Data Science at Visible. Before joining the team, he spent 15 years working in technology and data science on social impact projects across education, public health and social care. He holds a PhD in Computer Science.

Paul developed ME/CFS in 2022. After a difficult year trying to understand what was happening to his health, followed by another year of medical tests and appointments, he was finally diagnosed in 2024.

At Visible, he combines his firsthand experience of illness with his technical expertise, turning the data members share into tools they can trust and advancing scientific understanding of these conditions.

David Putrino is Director of the Cohen Center for Recovery from Complex Chronic Illness (CoRE) at Mount Sinai in New York, a leading US center for Long Covid, ME/CFS and related infection-associated chronic illnesses. He leads clinical trials investigating new treatments for these conditions and also serves as Director of Rehabilitation Innovation for the Mount Sinai Health System and Professor at the Icahn School of Medicine.

David is a scientific advisor to Visible and collaborates with the team on research to better understand what drives symptoms and how people living with complex chronic illness can better manage their health.

Boon Lim is a Consultant Cardiologist and Electrophysiologist at Imperial College Healthcare NHS Trust in London, specialising in heart rhythm conditions and autonomic disorders, including fainting (syncope), POTS and Long Covid.

He has published more than 100 peer-reviewed papers, many exploring the relationship between the autonomic nervous system and heart health. He is also the founder of StopFainting.com and author of Keeping Your Heart Healthy, published as part of Penguin’s Life Expert series.

Boon is a scientific advisor to Visible, bringing his expertise in autonomic function and heart rate variability to the development of Visible’s technology and research.