Privacy &
site information.

Website contact

This is the Rule & Reason website. Contact team@jonashertner.com about the website or information you provide through an enquiry.

Postal contact: Asylstrasse 41, 8032 Zurich, Switzerland. The responsible practice or entity for professional work is identified in the engagement.

Browser preferences

Your appearance choice is saved in this browser. Choosing “Follow device” removes the saved preference. Seasonal colours are calculated on your device without requesting your location or weather data.

The book remembers your choice of Book or Plain text view in this browser. Selections in its teaching example stay in the current page and are not sent to a server.

Hosting

GitHub Pages hosts this website and processes technical request information as described in the GitHub General Privacy Statement. Fonts and artwork are served with the site; they do not load from third-party font or image services.

Contact

The contact links open your email application. Information you choose to send is used to respond to your enquiry and discuss possible work. Before sharing matter materials, we can agree appropriate arrangements for their handling.

For questions about this website or your information, contact team@jonashertner.com.

Sources & design

Instrument Sans and Source Serif 4 are served with the site under the SIL Open Font License.

The homepage artwork was created for Rule & Reason using AI image generation. It depicts an imagined environment. Service examples are illustrative; they are not client case studies.

Insights distinguish editorial perspectives from source-based research. Specific advice and any professional engagement are agreed separately.