Part I - Scientific Composition and the New Mechanism.- 1. Laura Franklin-Hall: New Mechanistic Explanation and the Need for Explanatory Constraints.- 2. Kenneth Aizawa: Compositional Explanation: Dimensioned Realization, New Mechanism, and Ground.- 3. Jens Harbecke: Is Mechanistic Constitution a Version of Material Constitution?.- 4. Derk Pereboom: Anti-Reductionism, Anti-Rationalism, and the Material Constitution of the Mental.- Part II - Grounding, Science, and Verticality in Nature.- 5. Jonathan Schaffer: Ground Rules: Lessons from Wilson.- 6. Jessica Wilson: The Unity and Priority Arguments for Grounding.- 7. Carl Gillett: The Metaphysics of Nature, Science, and the Rules of Engagement.- 8. Andrew Melnyk: Grounding and the Formulation of Physicalism.- 9. Alyssa Ney: Grounding in the Philosophy of Mind: A Defense.