[7] In recent years, his research began to focus on nutritional epidemiology, using digital and AI-based tools to enable high-resolution food tracking in medical cohorts.

He has been a member the group developing the Decentralized Privacy-Preserving Proximity Tracing algorithm,[20] and the scientific lead behind the SwissCovid mobile phone application released by the Federal administration of Switzerland.

The latter is the first digital contact tracing application developed by a government that is based on the Google's and Apple's Exposure Notifications System.

[22][23] Since 2020 he has been a member of the Swiss National COVID-19 Science Task Force, the scientific corona advisory board of the Federal Council and the cantons.

[26] He is co-founder of the startup AIcrowd that maintains a collaboration platform for data scientists specialized in crowdsourcing AI solutions.