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I talked in front of many well-known companies and conferences in the past:


Airbnb / Home24 / Zalando / IHK / Optimizely / Peak Ace / SEO-Day / Trust Agents / Stylebook.de / Bild.de / ImmobilienScout 24 / SEO Campixx / Conversion Camp / M3 Campixx / Neuromarketing Day / Shortcon / KarlsCORE Public / DAALA Digital Analytics Association / CONlogne / MyHammer / e-Commerce Day / LEAP / suchradar / Internet World Messe / CO-­Reach / Sixt SEO Wiesn / Audi / eBay / PayPal / H-­Hotels.com / Mister Spex / sage / UBS / VDI / Sparwelt / Online Marketing Tag / SEA Stammtisch Berlin / relaunch Konferenz / OMKB / Meet Magento / Sixt / OMLIVE / Searchmetrics / Unbounce / Tech Open Air Berlin / OMX / SEOkomm / Digital Growth Unleashed / Searchmetrics Summit / ignition Business Lounge / Conversion Roadshow / OMR Online Marketing Rockstars Festival / AXCD Berlin / Digital Elite Day London / Digital Marketing Skill Share Bali / Dojo + Hubud Bali / CO-Hive Coworking / Marketing Underground Berlin

About me


I am one of the leading conversion optimization experts. Since 2004, I ran 2,000+ A/B/n-tests for more than 300 companies and built one of the biggest agencies specialized in conversion optimization.

Since leaving my agency in 2016, I’ve been focusing on my own clients and projects.

I am co-author of several books about conversion optimization, online marketing, and growth hacking. Each year, I speak on the stages of many popular conferences and well-known companies. Also, I am the CRO university lecturer for Google’s first European Digital Marketing Degree.

I work with small and medium sized brands as well as market leaders like Facebook, Airbnb, PayPal, Amazon Audible and ebay with the goal to improve my clients’ conversions or knowledge in the field.