Paul Pietroski is a Distinguished Professor in the Department of Philosophy and Center for Cognitive Science at Rutgers University. In his most recent book, Conjoining Meanings: Semantics without Truth Values (OUP, 2018), he argues that meanings are instructions for how to build concepts of a special kind. He is widely recognized as a leading figure in linguistics, and he has done a great deal to advance the field's understanding of how language is related to thought.