As a seasoned data science leader with more than 30 years in the fields of analytics, survey methodology and market research, I help teams to become more successfull by increasing efficiency and business relevance.I started my career at the University of Leuven, Belgium and then I worked for 10 years with The Nielsen Company. After that I was a consultant in Data Science and Big Data analytics. I then became the head of Marketing & Data Sciences, GfK Belgium. Currently I lead the Ipsos Audience Measurement data team in The Netherlands and I work with Ipsos' Global Audience Measurement data team.I have a master's degree in computer science (Leuven), a master's degree in quantitative applications in the social sciences (Brussels) and finally a Phd in Social sciences from the University of Leuven. I blog about Data Science (http://allthingsdatascience.blogspot.be/) but occasionally also on management and leadership in general and the Market Research Industry in particular. My Twitter handle is @IstvanHajnal, my Mastodon handle is @IstvanHajnal@mastodon.social.