Ton Wesseling

Profile

Ton Wesseling is the founder of Online Dialogue and one of the most influential figures in European conversion rate optimisation and marketing experimentation. Over two decades, he has built Online Dialogue into one of the continent's most respected CRO agencies, working with major European brands to build the data infrastructure, testing processes, and organisational cultures needed to make experimentation a sustainable competitive advantage. Wesseling is a vocal advocate for what he calls 'evidence-based marketing' — the idea that marketing decisions should be grounded in rigorous data and controlled experiments rather than intuition, convention, or the latest industry trend. He has been instrumental in raising the standard of CRO practice across Europe, both through his agency's work and through his extensive writing and speaking on the subject. He is a regular keynote speaker at major European marketing conferences and a founding figure in the European experimentation community.