Philosophers Michael E. Bratman, from Stanford University, and Margaret P. Gilbert, from UC Irvine, are this year’s recipients of the Lebowitz Prize for Philosophical Achievement and Contribution, presented by the Phi Beta Kappa Society and the American Philosophical Association. In their respective work, each has expanded on the question of “What is it to act together?” based on sometimes divergent philosophical underpinnings of how two or more individuals interact in a collaborative effort.