Peer Richelsen

Peer Richelsen is the Co-Founder and Chairman of Cal.com, a leading open-source scheduling infrastructure platform, and is currently based in Berlin, Germany. Serving as the company's Chief Executive Officer from 2021 before transitioning to his current board position, he directed the scaling of the core platform to process over ten million monthly bookings. Under his leadership, the startup secured more than $17 million in total venture funding, including a $10 million Series A extension in November 2024, and recently launched a dedicated enterprise tier for Fortune 500 clients. Richelsen has actively positioned the software within the broader developer ecosystem through strategic integrations and collaborations with prominent technology entities such as GitHub, Y Combinator, and Vercel. His professional background and current focus remain centered on advancing open-source infrastructure, building scalable developer tools, and engineering productivity software for enterprises.