In view of the centrality of Being and Time to Heidegger interpretation in recent decades, Vallega-Neu introduces Contributions first by reconsidering Being and Time in light of the transformative turn from prepositional thought to the poietic, performative character of thinking and language that marks the passage between the two works. She then discusses each of the "joinings" that structure the composition of Contributions. This graceful introduction provides students and scholars with a much-needed key for unlocking the thinking that underlies Heidegger's later writings.