Dr. Niels C.M. Martens is a philosopher of physics, astronomy & cosmology. Currently a Marie Curie PostDoc at Utrecht University, he will soon start as University Lecturer, with a 5-year ERC project on the tenability of the conceptual distinction between spacetime and matter in the context of astronomy and cosmology (e.g. dark matter, dark energy, black holes). His experience with the social epistemology of scientific collaborations stems from leading the Collaborations Focus Group of the History Philosophy Culture (HPC) Working Group of the Next Generation Event Horizon Telescope Collaboration (ngEHT), as well as being a former PostDoc in the Epistemology of the Large Hadron Collider Research Unit. Dr. Martens has published extensively on the interpretation of physical quantities and symmetries in physics.