Privacy Policy
Last updated: June 2026
This website is a pure information site — no user accounts and no advertising cookies. Reach measurement (Google Analytics) is used only with your consent; without consent no analytics cookies are set. The key notices under the GDPR follow below.
Controller
The controller under the GDPR is Leon Köllerwirth Hlihel, Paracelsusweg 5, 33689 Bielefeld, email: info@leonkoellerwirth.de.
Hosting
The site is hosted by a webspace provider (Strato AG). When the site is accessed, technically necessary data is processed so the page can be delivered.
Server log files
For delivery and security, the provider automatically collects server log files (e.g. IP address, date/time, requested file, browser type). The legal basis is the legitimate interest in secure operation (Art. 6 (1) (f) GDPR). This data is not merged with other sources.
Technically necessary storage (web app, preferences)
This website can be used as an installable web app (PWA). For this, your browser stores technically necessary data locally on your device: cached website files (service-worker cache, so the site loads fast and new versions are applied reliably) and your preferences for the colour scheme and cookie decision (localStorage). This storage is required to operate the website (§ 25 (2) no. 2 TDDDG); no personal data is transmitted to me or to third parties, and no tracking takes place. You can delete this data at any time via your browser settings.
Getting in touch
If you reach me by email, phone or — where enabled — the contact form, I process your details solely to handle the request (Art. 6 (1) (b)/(f) GDPR). Your data is only shared insofar as that is necessary to respond.
Reach measurement (Google Analytics)
On the basis of your consent (Art. 6 (1) (a) GDPR, § 25 (1) TDDDG) I use Google Analytics 4 for anonymous reach measurement — provider: Google Ireland Ltd., Gordon House, Barrow Street, Dublin 4, Ireland. Google Analytics is loaded, and cookies or comparable identifiers are stored on your device, only once you agree in the cookie banner; without your consent this does not happen. Processed data includes a shortened IP address, approximate location (country/region), pages viewed, time on page, and device and browser type. Data may be transferred to Google LLC in the USA; Google is certified under the EU-US Data Privacy Framework (adequacy decision of the EU Commission). You can withdraw or change your consent at any time with effect for the future via the “Cookie settings” link in the footer. After withdrawal, no further analytics cookies are set. Fonts are served locally only (no external font CDN). Measurement ID: G-HHBF6DC9XE.
Your rights
You have the right to access, rectification, erasure, restriction of processing, data portability and objection, as well as the right to lodge a complaint with a supervisory authority.