Mr Steven E. Petersen. The English Wikipedia has three red links for the Grawemeyer Award for recipients in the field of Psychology.
Mr Petersen was already known to Wikidata as the author of four publications. Some will argue that publications are the bread and butter of Wikipedia and they are.
The sum of all knowledge is one whole and as such all Wikimedia projects together are tools that bring all the information, all the knowledge to everyone. All do it in their own way and as such Wikidata does support Wikipedia and it supports Wikipedia among all the other things it is useful for.