Prior to joining Google, I was a computer science professor heading the User-Centric Data Science research group at the VU University Amsterdam. Our team invented the CrowdTruth crowdsourcing method and applied in various domains such as digital humanities, medical and online multimedia. I guided the human-in-the-loop strategies as a Chief Scientist at a NY-based startup Tagasauris. Currently I am also president of the User Modeling Society.
For a list of my publications, please see my profile on Google Scholar.