I help tech companies attract and retain customers. 12 years building growth systems in product-led and sales-led environments across health tech, recruiting, legal tech and e-commerce.https://jonasvillwock.com/enhttps://jonasvillwock.com/blog/research-about-ai-search-visibility/https://jonasvillwock.com/blog/research-about-ai-search-visibility/Four studies on what actually earns citations in AI search: controlled experiments, citation-pattern analysis and automated testing. Converging findings.Tue, 09 Dec 2025 06:59:31 GMThttps://jonasvillwock.com/blog/ymyl-in-ai-search/https://jonasvillwock.com/blog/ymyl-in-ai-search/I analyzed 600 AI citations for German YMYL queries. ChatGPT, Perplexity and Google AI agree just 5% of the time, and half the sources are English.Tue, 11 Nov 2025 06:57:24 GMThttps://jonasvillwock.com/blog/bow-tie-funnel/https://jonasvillwock.com/blog/bow-tie-funnel/How the bow tie funnel aligns marketing, sales and customer success across the whole lifecycle, from acquisition to expansion. Interactive walkthrough.Mon, 06 Oct 2025 07:00:01 GMThttps://jonasvillwock.com/blog/seo-vs-geo/https://jonasvillwock.com/blog/seo-vs-geo/I analyzed 51 German GEO agencies. The data shows most still rely on SEO tactics while marketing GEO. Here is what companies need to know.Tue, 09 Sep 2025 10:13:46 GMThttps://jonasvillwock.com/blog/stanford-study-employment-effects-ai/https://jonasvillwock.com/blog/stanford-study-employment-effects-ai/Stanford data shows employment for 22 to 25 year olds in AI-exposed jobs down 13%, while experienced workers in the very same roles grew by 6 to 9%.Sun, 31 Aug 2025 14:32:54 GMThttps://jonasvillwock.com/blog/chatgpt-mit-study/https://jonasvillwock.com/blog/chatgpt-mit-study/What MIT measured when people wrote with ChatGPT: weaker memory of their own text, less original phrasing, and less ownership of the resulting ideas.Thu, 21 Aug 2025 18:07:02 GMThttps://jonasvillwock.com/blog/product-led-growth-und-content-marketing/https://jonasvillwock.com/blog/product-led-growth-und-content-marketing/Warum Product-led Growth und SEO-getriebenes Content Marketing sich verstärken, wie sie die CAC senken und woran Sales-led Modelle oft scheitern.Wed, 31 May 2023 14:12:51 GMThttps://jonasvillwock.com/blog/core-web-vitals-of-100-startups-analyzed/https://jonasvillwock.com/blog/core-web-vitals-of-100-startups-analyzed/I measured the Core Web Vitals of 100 startup websites and most did not pass. What the data showed, plus the three fixes that recover the most score.Sun, 24 Jan 2021 14:15:48 GMThttps://jonasvillwock.com/blog/ab-testing-contingency-trap/https://jonasvillwock.com/blog/ab-testing-contingency-trap/Split testing can quietly narrow what you are willing to try. What sociology's idea of contingency explains about A/B testing culture, and how to fix it.Thu, 15 Oct 2020 11:47:00 GMT