# John Sjölund

> John Sjölund is the CEO and co-founder of Luna Diabetes, a San Diego medical-device company building a small overnight patch pump that automates insulin dosing for the tens of millions of people who use pens rather than pumps. A Swedish-American inventor named on 30-plus patents, he previously founded Timesulin with his brother Andreas (a co-creator of Skype), sold it to Bigfoot Biomedical in 2017, then built the Bigfoot Unity connected dosing system that Abbott acquired in 2023. In August 2025 Luna raised a $23.6M Series A led by Vensana Capital.

- **Role:** CEO & Co-Founder at Luna Diabetes
- **Organizations:** Luna Diabetes, Bigfoot Biomedical, Timesulin, Patients Pending Ltd, Acceleration E-Marketing
- **From:** Sweden
- **Nationality:** Swedish-American
- **Known for:** Co-founder and CEO of Luna Diabetes, which raised a $23.6M Series A in August 2025., Founded Timesulin, scaling a replacement insulin-pen cap to users across 40+ countries before its 2017 sale to Bigfoot Biomedical., Built and led the Bigfoot Unity connected dosing system, later acquired by Abbott Diabetes Care in 2023.

## Career timeline

- **2010** — Founded Patients Pending Ltd in London to develop diabetes self-management products.
- **2011** — Launched Timesulin with his brother Andreas Sjölund - a replacement insulin-pen cap that tracks time since the last dose.
- **2012** — Named one of Sweden's Ten Outstanding Young People (TOYP) by the Junior Chamber; recognized as Young Person of the Year.
- **2017** — Timesulin acquired by Bigfoot Biomedical; joined Bigfoot and led the Unity connected injection and dosing system.
- **2020** — Co-founded Luna Diabetes with Jon Brilliant and Sean Saint.
- **2023** — Bigfoot Unity acquired by Abbott Diabetes Care.
- **2024-10** — Luna launched its pivotal clinical trial for an automated insulin delivery system for pen users.
- **2025-08** — Luna raised a $23.6M Series A led by Vensana Capital.

## Achievements

- Co-founder and CEO of Luna Diabetes, which raised a $23.6M Series A in August 2025.
- Founded Timesulin, scaling a replacement insulin-pen cap to users across 40+ countries before its 2017 sale to Bigfoot Biomedical.
- Built and led the Bigfoot Unity connected dosing system, later acquired by Abbott Diabetes Care in 2023.
- Among the first people globally to build a working do-it-yourself automated insulin delivery (closed-loop) system.
- Lead or named inventor on more than 30 patents.
- Won the UK National Health Service award for Most Innovative Patient-Developed Digital Technology.
- Named one of Sweden's Ten Outstanding Young People (2012).

## Latest updates

- **2025-08** — Luna Diabetes raised a $23.6M Series A led by Vensana Capital, with participation from the Swiss Diabetes Venture Fund, Winklevoss Capital and Ascensia Diabetes Care.
- **2024-10** — Luna launched its pivotal clinical trial for an automated insulin delivery system aimed at insulin-pen users.

## Links

- Website: https://lunadiabetes.com
- LinkedIn: https://www.linkedin.com/in/johnsjolund/
- Twitter/X: https://x.com/johnsjolund

---

Profile page: https://yespress.io/john-sjolund
Published by YesPress — https://yespress.io
Last updated: 2026-06-11